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Ramon Llull: The Ars Magna, Combinatorial Art, and Mystical Philosophy

Updated: April 2026
Last Updated: March 2026, Article updated with current scholarship on Llull's influence on Leibniz, Bruno, and the history of computation.

Quick Answer

Ramon Llull (c.1232-1316) was a Catalan mystic and philosopher who, after a dramatic conversion from courtly life, developed the Ars Magna, a combinatorial system of rotating wheels combining nine Divine Dignities (Goodness, Greatness, Power, Wisdom, etc.) to generate rational arguments about any subject. His goal was to demonstrate Christian truths by necessary reason to Muslims and Jews. His combinatorial wheels influenced Leibniz, Bruno, and are now recognized as a proto-algorithmic precursor to computer science.

Key Takeaways

  • The conversion: Llull lived a courtly life until five successive visions of Christ crucified around age 30 transformed him entirely. He gave away most of his wealth, learned Arabic over nine years, and devoted his life to understanding and mission.
  • The Ars Magna: A combinatorial system using nine Divine Dignities (Goodness, Greatness, Eternity, Power, Wisdom, Will, Virtue, Truth, Glory) and rotating mechanical wheels to generate arguments about any subject. The first proto-algorithmic system in Western history.
  • Divine Dignities as real: The nine attributes are not mere concepts but real aspects of God that are also present in created things, each being participating in divine goodness, wisdom, and power at its appropriate level.
  • Theory of Correlatives: Every attribute and being has three internal aspects, active power, receptive capacity, and the act uniting them, a trinitarian structure woven through all of reality.
  • Rudolf Steiner connection: In Riddles of Philosophy (GA 18), Steiner identified Llull as a key figure in the progressive move toward making spiritual truths rationally transparent, anticipating the modern demand that understanding accompany belief.

🕑 22 min read

Life and Conversion: From Courtier to Mystic

Ramon Llull was born around 1232 or 1233 in Palma, on the island of Majorca, which had been reconquered from Muslim rule by James I of Aragon just a few years before Llull's birth in 1229. He grew up in a multilingual environment where Catalan, Arabic, and Latin coexisted, and the intellectual and cultural encounter between Christian, Muslim, and Jewish traditions was a lived reality rather than an abstract problem. This context shaped everything about his later work.

As a young man, Llull rose to the position of seneschal (court administrator) to James II, the future King of Majorca. He married, had children, enjoyed the privileges of the Majorcan aristocracy, and by his own later account led a life of worldly pleasure and poetic ambition. He wrote troubadour poetry and was deeply embedded in the courtly culture of the western Mediterranean.

The Five Visions of Christ

Around 1263, when Llull was approximately thirty years old, his life changed irrevocably. While writing a love poem at his desk, he looked up and saw Christ crucified appearing to him in the air. Frightened, he stopped writing and went to bed. The vision returned on succeeding nights, five times in total. Llull interpreted this as a divine call that he could not refuse. He could not identify what specifically he was being called to do, but the experience of being seen by the crucified Christ while engaged in worldly pleasures produced in him a radical break with his previous existence.

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He consulted his confessor, a Franciscan friar, who helped him identify three goals: to write the best book in the world against the errors of unbelievers; to establish schools where missionaries could learn the languages of those they sought to convert; and to go himself to preach among Muslims, ready to die for his faith. These three goals organized the next fifty years of his life.

He arranged his financial affairs, providing for his wife and children, gave away most of his wealth, and made a pilgrimage to various shrines. Then he returned to Majorca and spent approximately nine years in intensive study: Arabic (he hired a Muslim slave to teach him), theology, philosophy, and the intellectual traditions of Islam and Judaism. This was an extraordinary commitment. Arabic was not merely linguistically foreign but the vehicle of a sophisticated philosophical and religious tradition that he needed to understand from the inside if he was to engage it seriously.

Mount Randa: The Illumination That Changed Everything

Around 1274, after his years of study, Llull withdrew for contemplation to Mount Randa, a solitary hill in the interior of Majorca. In his autobiography, the Vita Coetanea (written in the third person around 1311), he describes what happened there as a divine illumination in which he understood how all knowledge could be organized into a single unified system.

He came down from the mountain and almost immediately wrote the first version of what he called the Ars compendiosa inveniendi veritatem, the Concise Art of Finding Truth (c.1274), the first of the series of works that would eventually be known collectively as the Ars Magna. He visited a Cistercian monastery at Santa Maria de la Real, where the abbot and monks helped him refine the text, and then began the process of revision and expansion that would occupy him for the rest of his life.

What Was Illuminated at Randa?

Llull was not given a vision of God or angels in the usual mystical sense. What he received was a cognitive illumination: he understood how the divine attributes (which he called the Dignities) are the structural principles of all reality, how they combine and interact in all created things, and how this structure could be used as the basis for a universal method of reasoning about any subject. The illumination was, in his own understanding, an intellectual insight into the correspondence between divine attributes and the structure of created things, a version of the law of correspondence applied to the whole of knowledge.

Llull would revise the Art many times over the following four decades, producing two major phases: the Quaternary Phase (c.1274-1290, with more figures and more complex combinations) and the Ternary Phase (c.1290-1316, simplified to three concentric circles and more accessible). The final, definitive version is the Ars Generalis Ultima (The Ultimate General Art, completed 1308) and its shortened version, the Ars Brevis (Short Art, also 1308), which remains the standard introduction to his system.

The Nine Divine Dignities: God's Real Attributes

The foundation of Llull's entire philosophical system is the set of nine Divine Dignities (Dignitates Dei). These are not merely names for God or concepts we apply to a divine being we cannot otherwise describe. For Llull, they are real aspects of the divine nature that are also genuinely present in all created things, each creature participating in divine goodness, greatness, power, and wisdom according to its level and capacity.

Latin Name English Letter Symbol
Bonitas Goodness B
Magnitudo Greatness C
Aeternitas / Duratio Eternity / Duration D
Potestas Power E
Sapientia Wisdom F
Voluntas Will G
Virtus Virtue H
Veritas Truth I
Gloria Glory K

In God, these nine Dignities are perfectly identical: divine goodness and divine greatness are not two different things in God but are really one. In the created world, they are distinct and present in varying degrees. A stone participates in divine goodness (it is good inasmuch as it is), in divine greatness (it has a magnitude), in divine power (it has certain active properties), but in a much lower and more limited way than a human being, and infinitely less than God.

The Dignities as Universal Connectives

The important move in Llull's system is that the same nine attributes appear at every level of being: in God (as infinite attributes), in angels (as high but finite attributes), in the human soul (as rational attributes), in animals, plants, and minerals (as progressively lower participations). This vertical continuity means that by studying the Dignities in the created world, we gain genuine (though partial) knowledge of the divine nature. It also means that all branches of knowledge, theology, physics, ethics, medicine, law, are ultimately about the same nine principles operating at different levels. This is the metaphysical basis for Llull's universal method.

Llull used letters of the alphabet to symbolize the Dignities, allowing them to be manipulated formally in arguments. A proposition like "B C" (Goodness-Greatness) would mean "God's goodness is great" or, at another level, "goodness operates in great magnitude," and could generate specific applications depending on the subject under discussion. This formal, symbolic approach to argument was genuinely novel in the thirteenth century.

The Ars Magna: A Combinatorial Art of Truth

The Ars Magna (Great Art) is the systematic implementation of the Divine Dignities as a universal reasoning machine. The physical structure of the Art consists of several concentric circles that can be rotated independently, each ring containing letters representing the nine Dignities or other sets of principles. By rotating the circles and reading the combinations that appear in alignment, the practitioner generates pairs and triples of principles that can then be used as the foundation for questions and arguments.

To understand what this means in practice, consider a simple example. If the question is "Is God good?" the practitioner aligns the letter B (Goodness) with B (Goodness) and reads: divine goodness is good. This is trivially true. But if the question is "Is creation good?" the practitioner aligns B (Goodness) with various principles for creation and generates the argument that creation participates in divine goodness and is therefore good, not independently but derivatively. More complex questions about the Trinity, the Incarnation, or the soul's immortality can be addressed by combining the relevant principles through the rotating figures.

The Lullian Wheels: First Mechanical Reasoning System

The physical rotating discs of the Ars Magna are the first documented mechanical system designed to assist or automate reasoning. Each circle is divided into sections containing the letters representing the nine Dignities. By rotating the inner circle relative to the outer, different combinations of principles appear in the windows cut through the circles. A practitioner could, in principle, systematically generate every possible combination of three Dignities (there are 504 possible three-element combinations from nine elements) and address questions about each. This combinatorial exhaustiveness was central to Llull's apologetic aim: he wanted to show that for any question a Muslim or Jewish interlocutor might raise, the Art could generate a response grounded in universally accepted rational principles.

The Art also included a set of nine absolute principles (the Dignities), nine relative principles (difference, concordance, contrariety, beginning, middle, end, majority, equality, minority), nine types of question (whether, what, of what kind, how much, why, how, when, where, with what), and nine subjects (God, angel, heaven, man, animal, plant, mineral, and others). The practitioner could combine elements from any of these four sets to generate a specific question and then use the combinatorial figures to address it.

The Theory of Correlatives: Trinitarian Structure of All Reality

One of the most original and technically sophisticated elements of Llull's metaphysics is his theory of Correlatives, developed in the Ternary phase of the Art. Llull observed that every real attribute or being has three intrinsic aspects: an active power (expressed with the suffix -ivum), a capacity for receiving the activity (expressed with the suffix -ibile), and the act uniting the two (expressed with the suffix -are).

In the intellect: intellectivum (the power to know), intelligibile (what is knowable, the object), and intelligere (the act of understanding). In fire: ignitivum (the power to burn), ignibile (what is combustible), and ignire (the burning). In divine Goodness: bonificativum (the active power of goodness), bonificabile (what receives or is made good), and bonificare (the act of being-good or making-good).

The Trinity Written Into Reality

Llull's Correlatives were designed to show that the Christian doctrine of the Trinity is not an arbitrary or mysterious dogma imposed from outside but reflects a structure that is genuinely present in all real beings and attributes. Wherever there is a real activity, there must be an active principle, a capacity to receive the activity, and the act uniting the two. In God, these three aspects are infinite and really identical (not three gods but three "co-principles" of the one divine act). In created things, they are finite, distinct, and dependent. The Trinity is, for Llull, the most transparent example of a structure that pervades all of reality from top to bottom.

This trinitarian structure was important for Llull's apologetic goals because it gave him a philosophical argument for the Trinity that did not simply appeal to scriptural authority: wherever there is a real attribute in God (Goodness, Wisdom, Power), that attribute must have its active, receptive, and act correlates, and these correlates in the infinite being are what Christians call Father, Son, and Holy Spirit. The argument has obvious problems (most philosophers would deny the move from the structure of finite attributes to conclusions about infinite divine persons), but its form is philosophical rather than merely authoritative, which was exactly Llull's aim.

The Sixth Sense and Analogic Knowledge

Llull proposed the existence of a sixth cognitive faculty beyond the standard Aristotelian five senses. He called it variously the affatus or the sensus communis, but in context what he meant was something like a spiritual sense, a power of the soul that perceives spiritual realities through bodily imagery and affective experience rather than through purely intellectual abstraction.

This sixth sense is the organ through which the mystic perceives divine presence in created things: not merely infers it by argument but directly experiences it. For Llull, the lover in the Book of the Lover and the Beloved perceives the Beloved (God) in every flower, every bird, every human encounter because the sixth sense is alive and active, perceiving the divine Dignities wherever they are present.

Analogic Knowledge: Nature as a Mirror of God

Llull's principle of analogic knowledge holds that higher spiritual realities can be known through their reflections in lower, more accessible realities. Just as a mirror shows the face without being the face, a flower's beauty shows divine Goodness without being divine Goodness. The practitioner of Llull's Art was trained to read created things as expressions of the Dignities, moving from the visible trace of divine attributes in nature to a genuine (though partial and indirect) knowledge of God. This is not mere analogy in the logical sense but a real cognitive ascent made possible by the genuine participation of created things in divine attributes.

The Literary Mystic: Blanquerna and the Lover

Alongside his philosophical works, Llull was a major literary figure in medieval Catalan literature. His novel Blanquerna (c.1283) traces the spiritual career of its protagonist from birth through successive stages: he becomes a monk, then an abbot, then a bishop, then pope, and finally retires as a hermit to spend his remaining years in contemplative union with God. The novel is an extended meditation on how the spiritual life can be lived at every level of society, from the hermitage to the papal throne.

Embedded within Blanquerna is the Book of the Lover and the Beloved, one of the most remarkable mystical texts in medieval literature. It consists of 366 brief aphorisms (one for each day of the year, including leap years), each presenting a paradox or image from the relationship between the soul (the Lover) and God (the Beloved). The style is strongly influenced by Sufi poetry, particularly the tradition of Ibn Arabi, whom Llull had studied in Arabic, and the language is erotic, paradoxical, and deeply personal.

A typical aphorism from the Book: "The Lover asked his Beloved: 'Do you love me, or do you not love me?' The Beloved replied: 'If I did not love you, would it be that you loved me? And if I did love you, would I want you to be ignorant of it?'" The paradox points to the mutual constitution of lover and beloved: the soul's love for God is possible only because God already loves the soul, and God's love is not made visible to the soul except through the soul's own loving response.

His other major novel, Felix, or the Book of Wonders (c.1287-1289), follows a young man named Felix whose father sends him into the world to learn wonder at the marvels of creation. The novel is organized around the hierarchy of being from God and angels through the natural world to human society, with Felix encountering teachers who explain each level through parables, dialogues, and exemplary stories. It is, in effect, a literary presentation of Llull's philosophical system for a non-specialist audience.

Mission and Martyrdom: Three Trips to North Africa

Llull made at least three missionary journeys to North Africa, each time risking his life to preach Christianity to Muslim scholars and rulers. The first was around 1293 to Tunis, where he engaged in public disputations and was eventually imprisoned and expelled. The second was around 1307, again to Tunis, where he was initially successful and reportedly converted some people before being expelled again. The third and final journey was around 1314-1316 to Bougie (now Bejaia, Algeria) and possibly again to Tunis.

The traditional account of his death, accepted in his beatification process, holds that he was stoned by an angry crowd in Bougie in 1316 while preaching, was rescued by Genoese merchants, and died either at sea or shortly after reaching Majorca. Some historians are skeptical of the martyrdom narrative, noting that documentary evidence is thin, but the tradition is consistent and was widely believed within a generation of his death.

The Council of Vienne (1311)

In 1311, at approximately 79 years old, Llull appeared before the Council of Vienne in France to press two proposals he had been advocating for decades: the establishment of language schools at major universities to train missionaries in Arabic, Hebrew, and other languages, and the organization of a new crusade to the Holy Land. The council accepted the first proposal in a modified form: it decreed that Arabic, Hebrew, Greek, and Chaldean should be taught at the universities of Paris, Oxford, Bologna, Salamanca, and the Roman Curia. This was a genuine, lasting institutional result of Llull's decades of advocacy, though the language schools were poorly implemented in practice.

From Llull to Leibniz and Bruno: The Art's Later Life

The history of Llull's influence after his death is as significant as his immediate impact. The Ars Magna circulated widely in manuscript throughout the fourteenth and fifteenth centuries, generating a tradition of Llullism in various European university centers, particularly in Paris and in the Iberian peninsula.

Giordano Bruno (1548-1600), whose own work on the infinite universe we have explored elsewhere, was deeply influenced by Lullism in his development of magical memory systems. Bruno's mnemonic works (De Umbris Idearum, 1582; Ars Memoriae, 1582) combined the classical art of memory (organizing images in imagined architectural spaces) with Lullian combinatorial figures and Hermetic magical practice. Frances Yates, in The Art of Memory (1966) and Giordano Bruno and the Hermetic Tradition (1964), traced the specific ways Bruno transformed Lullian combinatorics into a Hermetic magical system designed to inscribe divine principles on the soul of the practitioner.

Gottfried Wilhelm Leibniz (1646-1716) engaged with Llull's Art directly in his early work, including a student dissertation titled Dissertatio de Arte Combinatoria (1666). Leibniz saw in Llull's combinatorial method a precursor of his own dream of a characteristica universalis, a universal symbolic language in which any question could be expressed formally and any answer could in principle be calculated. Leibniz's later development of calculus, binary arithmetic, and formal logic are not direct descendants of Llull, but his engagement with Lullian combinatorics in his youth shows that Llull's ideas were genuine intellectual provocations for one of the greatest mathematical and philosophical minds of the early modern period.

Modern computer scientists and historians of logic, including Javier Aguiló and others, have recognized Llull's wheels as a genuine proto-algorithmic system: a mechanical device designed to systematically generate all combinations of a finite set of elements. This does not make Llull a computer scientist, but it does mean that his combinatorial intuition anticipated a structural insight that became central to modern computation: that a finite set of primitive elements, systematically combined, can generate an indefinitely large range of outputs.

Steiner on Llull: Rational Transparency of Spirit

Rudolf Steiner discussed Ramon Llull at several points in his historical and philosophical work, most directly in Riddles of Philosophy (GA 18). Steiner's reading of the medieval period focused on the progressive development of individual intellectual consciousness, and he saw Llull as an important transitional figure between the communal spiritual vision of earlier medieval thinkers and the modern demand for rational self-understanding.

Llull's central conviction, that the truths of Christianity should be demonstrable by necessary rational argument rather than simply asserted on the basis of scriptural authority or church teaching, anticipates what Steiner regarded as a defining characteristic of modern spiritual life: the human being's need to understand what it affirms. A faith that cannot give reasons for itself is, for the modern consciousness, increasingly unstable. Llull saw this before it became a cultural crisis, and he attempted to address it by making the philosophical structure of spiritual truth visible to reason.

The Dignities and Steiner's Spiritual Forces

Steiner's own account of spiritual reality describes how spiritual forces, described in Anthroposophy as hierarchical beings and their activities, express themselves in natural phenomena. This is structurally similar to Llull's account of how the Divine Dignities are genuinely present and active at every level of created being. The specific content differs significantly between Llull's theological framework and Steiner's spiritual scientific one, but the fundamental intuition, that natural phenomena are expressions of spiritual realities that can be known by a trained cognitive faculty, connects them across seven centuries of intellectual history.

Steiner also valued Llull's insistence on the integrity of the intellectual faculty in spiritual knowing. Llull did not ask his readers to suspend reason and accept authority. He asked them to engage their reason as fully as possible and then follow where it led. The Art was designed to make the reasoning process transparent and repeatable: anyone could apply the wheels and see how the arguments were generated. This intellectual honesty about method was, for Steiner, an important forerunner of the rigour he demanded in spiritual scientific investigation.

Llull connects to several other figures in the philosophical tradition we have been exploring. His combinatorial approach to universal knowledge anticipates Nicholas of Cusa's attempt to think the infinite through the concept of the maximum. His mystical writings in the Book of the Lover and the Beloved draw on the same apophatic and affective traditions that shaped Pseudo-Dionysius and the Rhineland mystics whom Albertus Magnus helped to form. And his dream of a universal philosophical language that could overcome religious difference points forward to the Florentine humanists of the fifteenth century who also sought a philosophia perennis that would unite all spiritual traditions.

Frequently Asked Questions

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What is the Ars Magna of Ramon Llull?

The Ars Magna (The Great Art) is Ramon Llull's system for combining the nine divine attributes (Goodness, Greatness, Eternity, Power, Wisdom, Will, Virtue, Truth, Glory) to generate arguments about any subject in philosophy, theology, or natural science. Using concentric rotating discs, different attributes can be combined to produce questions and answers. Llull's goal was to demonstrate the truths of Christianity by necessary rational argument accessible to Muslims and Jews, bypassing the need for faith alone.

Who was Ramon Llull?

Ramon Llull (c.1232-1316) was a Catalan mystic, philosopher, poet, and missionary born in Majorca. He lived a courtly life as seneschal to the King of Majorca until a dramatic conversion experience around age 30, when he experienced five successive visions of Christ crucified. He gave away most of his wealth, learned Arabic, and devoted the rest of his long life to developing the Ars Magna and to missionary work among Muslims and Jews in North Africa. He wrote over 250 works in Catalan, Latin, and Arabic.

What are the Divine Dignities in Llull's philosophy?

The Divine Dignities are the nine attributes of God that Llull placed at the foundation of his Art: Goodness, Greatness, Eternity/Duration, Power, Wisdom, Will, Virtue, Truth, and Glory. For Llull, these are not merely conceptual labels but real aspects of divine being that are also present, in diminished form, throughout all created things. Every being participates in divine goodness, greatness, power, and wisdom according to its level of being.

Did Ramon Llull invent the first thinking machine?

Llull's concentric rotating discs (the Lullian Wheels) are often cited as an ancestor of combinatorial and algorithmic thinking. Gottfried Leibniz, who developed calculus and was fascinated by the idea of a universal calculus of reasoning, credited Llull as an important precursor. Modern computer scientists sometimes describe the wheels as a proto-algorithm or conceptual precursor of the computer, though Llull himself had spiritual and apologetic, not technological, goals.

What is the theory of Correlatives in Llull?

Llull's theory of Correlatives holds that every being and every attribute has three internal aspects: an active principle (-ivum), a passive principle (-ibile), and the act uniting the two (-are). For example: intellectivum (power to know), intelligibile (what is knowable), and intelligere (the act of knowing). This trinitarian structure is not merely formal but reflects the actual metaphysical structure of all real beings, which in turn reflects the trinitarian structure of God.

What happened to Ramon Llull at Mount Randa?

Around 1274, after approximately nine years of intensive study, Llull withdrew to Mount Randa on Majorca for contemplation. He experienced an illumination in which he understood how all knowledge could be organized through the combinatorial system he would call the Art. He descended from the mountain and almost immediately wrote the first version of what would become the Ars Magna. The Randa illumination is the founding moment of his philosophical career.

How did Giordano Bruno use Llull's Art?

Giordano Bruno was deeply influenced by Llull's Art, especially the combinatorial figures and the idea of a universal system generating all possible knowledge from primitive principles. Bruno transformed the Lullian Art into a more explicitly Hermetic and magical system, combining it with the classical art of memory to create a system of magical images organized according to Lullian combinatorial principles. Frances Yates's analysis in The Art of Memory (1966) showed how Bruno's magical memory systems drew on Llull's combinatorial logic within a Neoplatonic framework.

Was Ramon Llull a martyr?

The circumstances of Llull's death are uncertain. One tradition holds that he was stoned to death in Bougie (now Bejaia, Algeria) in 1316 while preaching, making him a martyr. Other accounts suggest he died at sea or on Majorca, possibly from natural causes. He was beatified by Pope Pius IX in 1847, and his feast day is June 30. The Franciscan Order has venerated him as a martyr since shortly after his death.

What literary works did Ramon Llull write?

Llull wrote over 250 works in Catalan, Latin, and Arabic. His literary masterpieces include Blanquerna (c.1283), a philosophical novel containing the embedded Book of the Lover and the Beloved, one of the most beautiful mystical texts in medieval literature. Felix, or the Book of Wonders (c.1287-1289), is a philosophical novel exploring natural philosophy and theology through the adventures of a young seeker. His vast Book of Contemplation in God (c.1273-1274) is one of the largest works in medieval Catalan literature.

How does Rudolf Steiner connect to Ramon Llull?

In Riddles of Philosophy (GA 18), Steiner discussed Llull as a significant figure in the development of Western thought toward the "philosophy of freedom." Llull's conviction that spiritual truths can be made rationally transparent, demonstrated through necessary argument rather than mere authoritative assertion, anticipates the modern demand that the human being understand what it believes. Steiner also valued Llull's theory of Divine Dignities as real attributes of God present in created things, connecting to Steiner's understanding of spiritual forces expressing themselves in natural phenomena.

The Eternal Question That Drove a Life

Ramon Llull spent more than fifty years asking one question in a hundred different ways: how can spiritual truth be made visible to a mind that has not yet seen it? His answer, worked out in philosophical systems, rotating wheels, missionary journeys, and mystical poetry, was that truth is already present in every created thing, in every attribute of beauty, goodness, and power that the natural world displays. The Ars Magna is a map, and the territory it maps is everywhere around us. The capacity to read it is already in us. The work is learning to turn the wheels.

Sources & References

  • Bonner, A. (1985). Selected Works of Ramon Llull (2 vols.). Princeton University Press.
  • Bonner, A. (2007). The Art and Logic of Ramon Llull: A User's Guide. Brill.
  • Llull, R. (c.1283). Blanquerna. Translated by E. Peers. Jarrolds, 1926.
  • Llull, R. (1308). Ars Brevis. Translated by A. Bonner. In Selected Works, Vol. 1.
  • Yates, F. (1966). The Art of Memory. Routledge and Kegan Paul.
  • Yates, F. (1954). "The Art of Ramon Lull: An Approach to It through Lull's Theory of the Elements." Journal of the Warburg and Courtauld Institutes, 17(1-2), 115-173.
  • Steiner, R. (1914). Riddles of Philosophy (GA 18). Anthroposophic Press, 1973.
  • Leibniz, G. W. (1666). Dissertatio de Arte Combinatoria. In Sämtliche Schriften und Briefe, Series VI.
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