Quick Answer
Couliano's claim is that the Renaissance magician and the modern advertiser are doing the same thing, and he has a mechanism rather than a slogan. Magic worked on the imagination by installing images that bind; so does erotic attraction; so does persuasion at scale. Bruno wrote the manual. The Reformation shut the whole enterprise down by attacking images, and the technique resurfaced without its metaphysics. It is brilliant, fast, and the modern parallel is asserted more than shown.
Key Takeaways
- Magic as applied psychology, operating on images rather than on spirits.
- Eros and magic share a mechanism, which is the book's central move.
- Bruno's De vinculis read as a manual of manipulation.
- The Reformation killed it by censoring the imagination, on his account.
- The advertising claim is the famous part and the least demonstrated.
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What This Book Is
Eros and Magic in the Renaissance appeared in French in 1984 and in English, from the University of Chicago Press, in 1987. It runs around three hundred pages.
It is a study of Renaissance magic that treats it as a technology rather than as a religion: a set of techniques for operating on people, grounded in a coherent psychology that its practitioners took to be true.
The central figures are Marsilio Ficino, who supplies the theory, and Giordano Bruno, who supplies the most developed application.
The book ends by proposing that the enterprise did not disappear when the metaphysics collapsed, and that its techniques persist in the modern industries of persuasion.
The English title. The French original is Éros et magie à la Renaissance: 1484, the date being the year Ficino's Plotinus translation was under way and Pico was preparing his theses. The dropped date removes a signal about how tightly the book is anchored to a specific moment.
Who Ioan Couliano Was
Ioan Petru Culianu, who published in English as Couliano, was born in Romania in 1950 into an academic family with a difficult relationship to the communist state.
He defected in 1972 while travelling in Italy, and spent years in precarious circumstances before establishing himself academically in the Netherlands and then in the United States.
He became close to Mircea Eliade, the great historian of religion, who was his patron and eventually his colleague at the University of Chicago, and he succeeded to Eliade's position after his death.
He was prodigiously productive: books on Gnosticism, on out-of-body journeys, on the history of religious ideas, on Renaissance magic, several of them written in his third or fourth language.
He also wrote about Romanian politics after the 1989 revolution, publicly and critically, including about the persistence of the old security apparatus and about Eliade's own interwar political associations.
The Murder
In May 1991 Couliano was shot in the head in a washroom at the Divinity School in Chicago. He was forty-one.
The killing had the character of an execution: a single shot from close range, in a locked stall, in a building full of people, with no robbery and no witnesses.
No one has been charged. The investigation considered several possibilities and the speculation has centred on his political writing, in particular his criticism of the post-revolutionary Romanian government and of the security services.
This is not directly relevant to the book and it is impossible to read him without knowing it, and the biography that followed treats the two as connected in ways that remain unproven.
The relevant point for a reader is that his work stops here. He was in the middle of a large project and the later books that would have tested these arguments do not exist.
The Psychology He Reconstructs
The foundation of the whole argument, and it needs stating because it is genuinely alien.
Renaissance thought inherited from Aristotle, through the Arabic commentators and the scholastics, a model of the soul with a specific problem in it.
The problem: the intellect is immaterial and the senses are material, and nothing purely immaterial can receive anything purely material. Some intermediary is required.
The solution was pneuma, a subtle substance, more refined than body and less refined than soul, circulating in the body and centred on the heart. Sense impressions are transmitted to it, and the intellect reads them there.
The consequence, which Couliano presses hard, is that the soul does not perceive the world directly. It perceives images formed in the pneumatic vehicle, and everything mental happens in that medium.
Phantasms
The images themselves, and the operative term of the book.
A phantasm is what is formed in the pneumatic apparatus: an image derived from sense, retained, combined with others, and made available to thought.
The doctrine that follows is stated repeatedly in the period and is startling to a modern reader: the soul never thinks without a phantasm. There is no thought that is not an operation on images.
This makes the imagination the central faculty rather than a decorative one. It is not where fictions are made; it is where cognition happens, and anything that reaches the mind reaches it as an image.
The practical implication is immediate. Whoever controls what phantasms form in a person controls what that person thinks, wants and does, and the whole of Couliano's book follows from this.
The move that makes the book work is recognising that this is not a theory of the supernatural. Nothing in the phantasmic psychology requires spirits, demons, or any occult force. It is a model of how minds work, wrong in its physiology and internally coherent, and the magic built on it is applied psychology rather than superstition. That reframing is what lets Couliano treat Renaissance magicians as engineers rather than as believers, and it is the reason the modern parallel is even arguable.
How Love Works
The first application, and the one that gives the book its title.
On the phantasmic model, falling in love is a specific event: an image of the beloved forms in the pneumatic apparatus and takes up residence there.
The image then behaves like an occupying force. It recurs without being summoned, displaces other content, absorbs attention, and organises the lover's behaviour around itself.
The medieval literature on lovesickness treated this as a disease with a physiology, and the tradition Couliano traces takes it entirely seriously as a pathology: a phantasm that has become fixed and is consuming the apparatus that holds it.
What is striking is how well the description matches the experience. The obsessive image, the loss of control over one's own attention, the sense of being operated on rather than choosing: that is what infatuation is like, and the model accounts for it precisely.
How Magic Works
The second application, and the identification the book turns on.
If love is a phantasm installed and holding, then a person who could install phantasms deliberately would have the power that love has, aimed wherever they chose.
That, on Couliano's reading, is what Renaissance magic was. Not the coercion of spirits, but the deliberate production of images in the pneumatic apparatus of a target, using whatever means will carry an image: words, music, gesture, scent, objects, ritual arrangement.
The talismans, the invocations, the correspondences between planets and materials, all of it is a technology for shaping what forms in someone's imagination, including the magician's own.
This explains a feature of the literature that otherwise puzzles readers: the enormous attention to sensory detail. The right colour, the right hour, the right sound, the right smell. If the operation is on images, then the material that produces images is the whole of the technique.
Ficino and the Spiritual Physician
The theorist, and the more benign face of the enterprise.
Marsilio Ficino was a priest, a physician's son, a translator of Plato and Plotinus, and the central intellectual figure of the Florentine revival.
His work on the care of the scholar's health prescribes music, light, particular foods, images to be contemplated, and objects to be kept nearby, all of it aimed at regulating the spirit and therefore the phantasms it carries.
Couliano reads this as therapeutic magic: the operator working on his own apparatus, adjusting what forms in it, in order to keep the melancholy that afflicts intellectual work from becoming pathological.
The ethical position is clear enough in Ficino. The techniques act on the person applying them, and consent is not a question because there is only one party.
What happens when the same techniques are aimed outward is the rest of the book.
Bruno and the Bonds
The application, and the most unsettling section.
Giordano Bruno, better known for his cosmology and for being burned in 1600, wrote a treatise called De vinculis in genere, on bonds in general.
The bonds in question are the means by which one person can be held and moved by another. Bruno analyses them systematically: what makes a person bindable, what kinds of bond exist, how they are established, how they are maintained, how they fail.
His conclusions are cold. The operator must know what the subject desires and fears, since these are the handles. The operator must not be bound in return, and must feel nothing for the subject. The bond works best when the subject believes they are acting freely.
Bruno explicitly extends this from individuals to crowds, and discusses how a population is bound by images, by shared desire, and by the manipulation of what they collectively imagine.
Couliano's summary, that this is a manual of psychological manipulation written in 1590, is not an exaggeration of what the text says.
What the Magician Must Be
A detail worth extracting, since it is the ethical heart of the material.
The magician, on Bruno's account, must remain unbound. To operate on another's phantasms, you must not be operated on by them, which requires a specific interior condition: interest without attachment, understanding without sympathy.
The requirement follows from the mechanism. A phantasm that grips you controls you, so the operator must be someone in whom images do not take hold.
Couliano notes without much comment that this describes a person who cannot love, and that the manual for manipulating others is also a prescription for a particular kind of damage in the person following it.
That observation is the closest the book comes to a moral position, and it is more effective for being brief.
The Art of Memory
The other Renaissance practice standing behind this book, and Couliano treats it as the same technology under a different name.
The classical art of memory, inherited from Roman rhetoric and elaborated enormously in the Middle Ages and the Renaissance, worked by placing vivid images at locations in an imagined building and walking through it to recall them.
The technique rests on the same psychology. If thought happens in images, then memory is the storage and retrieval of images, and the art is a set of procedures for depositing them where they can be found.
Bruno wrote extensively on memory, producing systems of daunting complexity in which the images are arranged on wheels, combined mechanically, and linked to the whole order of the cosmos.
What Couliano notices is that Bruno's memory systems and his account of bonds are continuous. Both concern the placement of images: one in your own apparatus, one in someone else's, using the same understanding of how images take hold and what makes them stick.
The practical requirements are identical in both. An image must be striking, emotionally charged, unusual, and connected to desire or fear if it is to lodge. That is the rule for a memory image and it is the rule for a bond, and it is also, for what it is worth, the rule any working advertiser would give.
The Reformation Censorship
The historical thesis, and the most contested part of the argument.
Couliano's claim is that Renaissance magic did not fade or get refuted. It was suppressed, and the suppression came from both sides of the confessional divide.
Protestant reform attacked images directly: stripped churches, destroyed statues, replaced the visual with the verbal, and treated the imagination as the faculty through which idolatry enters.
Catholic reform did something structurally similar in a different register, regulating images and disciplining the practices, including devotional ones, that worked on the imagination.
The result, on his account, was a culture in which the imagination was under suspicion, and in which the intellectual framework that made magic thinkable stopped being available.
What replaced it was a psychology in which mental content is not images, and a science with no place for the pneumatic apparatus, so that the magic did not have to be disproved. Its foundations were removed from underneath it.
The Advertising Claim
The book's most quoted proposition and the one that requires the most caution.
Couliano argues that the operation Renaissance magic described did not end. What ended was the theory. The technique, which works by producing images that bind desire, was rediscovered and industrialised.
His candidates are advertising, public relations, and political communication: enterprises whose explicit business is the production of images intended to install themselves in the minds of a mass audience and to organise what those people want.
The parallel is genuinely striking. Bruno's requirements, know the desires and fears, remain unmoved yourself, ensure the subject believes they chose freely, are recognisable as a description of the discipline.
The weakness is that Couliano asserts continuity where the evidence supports only resemblance. Nobody in the twentieth century read De vinculis and built an industry from it, and the fact that two practices share a structure does not make one the descendant of the other.
What is defensible is the weaker claim: that the phantasmic model describes what persuasion at scale actually does better than the accounts persuasion gives of itself, and that Bruno saw the mechanism four centuries early.
Against Yates
The scholarly disagreement running under the book.
Frances Yates had established the modern reading of Renaissance magic, and it was a religious reading: Hermetic magic as a route to the divine, the magician as a priest of a universal religion, the whole enterprise oriented upward.
Couliano's picture is different in temperature. His magicians are technicians. The interest is in what works, the orientation is horizontal rather than vertical, and the transcendent goals are less prominent than the operational ones.
Neither reading is simply wrong, and the sources support both because the sources contain both. Yates selected the material that supports religion; Couliano selected the material that supports technique.
Couliano's advantage is that his reading explains De vinculis, which is difficult to fit into a religious account of the period at all.
The Objections
Three, and they are the standard ones.
The modern link is unproven. Discussed above, and it is the criticism most often made.
The Reformation thesis is too tidy. The suppression of the imagination is a real phenomenon and it is one of several things happening, alongside the new science, the changing economy, and the internal exhaustion of the magical programme itself.
Bruno is systematised. Couliano reads De vinculis as a coherent manual. Bruno's texts are frequently digressive, unfinished, and self-contradicting, and the coherence may belong to the reader.
What It Is Worth
Three things it delivers regardless of the objections.
The phantasmic psychology. Recovering this model, and showing that magic was built on it rather than on credulity, is a real contribution and it makes the primary sources intelligible.
De vinculis brought forward. A text almost nobody read is now discussed, and it deserves to be.
The question about technique. Whether a method survives the theory that produced it is a serious question, and Couliano at least asks it with a specific case in hand.
Who Should Read It
Read it if you are interested in Renaissance magic and want an account that treats it as intelligent rather than as charming.
Read it if the history of the imagination as a faculty interests you, since this and Corbin between them cover most of the ground.
Read it if you work in any persuasion trade, because the discomfort is instructive.
Do not read it as established history. It is an interpretation of considerable force and its central modern claim is a proposal.
The uncomfortable thing here is not the historical argument. It is the model underneath it: that thinking happens in images, that images arrive from outside, and that whoever supplies them has already done most of the work of deciding what you will want. You do not have to accept the pneumatic physiology to notice that the images occupying your attention today were mostly produced by people who were paid to produce them, and that you did not select them. Bruno's requirement that the subject believe they are choosing freely is the only part of the technique that has not needed updating.
Renaissance magic read as a technology of the imagination, by a scholar who did not live to finish the argument.
Affiliate disclosure: Thalira earns a small commission on purchases made through the link above, at no additional cost to you. Our account of where the modern parallel is asserted rather than demonstrated is set out above and is independent of the link.
Frequently Asked Questions
What is Eros and Magic in the Renaissance about?
Ioan Couliano's argument that Renaissance magic was a technology operating on the imagination, that erotic attraction and magical operation shared a single mechanism, and that modern persuasion industries descend from it.
Who was Ioan Couliano?
A Romanian historian of religion, 1950 to 1991, who defected from Romania, studied under Mircea Eliade and succeeded him at the University of Chicago. He was murdered there in an unsolved shooting.
What is a phantasm?
In the psychology Couliano describes, an internal image formed by the faculty that mediates between sense and intellect. Renaissance thought held that the soul thinks in phantasms rather than directly in concepts.
How are eros and magic connected?
Both work by installing a phantasm. The lover is bound by an image that dominates their inner life, and the magician operates by producing such images in others, so the mechanism is identical.
What is Bruno's De vinculis?
A treatise on bonds, meaning the means by which people are held and moved. Couliano reads it as a systematic manual of manipulation, applicable to individuals and to crowds.
What does he say about the Reformation?
That both Protestant and Catholic reform attacked the imagination, censoring images and the practices that worked on them, and that this closed the culture in which magic had been intellectually possible.
Is the advertising claim serious?
Yes, and it is the book's most quoted line. He argues that public relations and advertising perform the operation Renaissance magic described, using the same mechanism with better distribution.
How does he differ from Frances Yates?
Yates read Renaissance magic as religion and as a route to the divine. Couliano reads it as an applied science of the imagination, more concerned with technique and control than with transcendence.
Is the book difficult?
Moderately. The prose is vivid and the argument moves fast, and it assumes familiarity with Renaissance philosophy and with the medieval psychology of the imagination.
What are the main criticisms?
That the modern parallel is asserted rather than demonstrated, that the Reformation thesis is too neat for the evidence, and that Bruno is read more systematically than his texts support.
How did he die?
He was shot in a washroom at the University of Chicago Divinity School in May 1991. The case has never been solved, and speculation has centred on his political writing about Romania.
Who should read it?
Readers interested in Renaissance magic, in the history of the imagination as a faculty, or in the question of what happened to magical technique when the culture that housed it collapsed.
Notice who supplied the picture
Couliano's Renaissance thinkers held that you cannot think without an image, and that the image is not something you generate at will. It arrives, from the senses, from memory, from whatever has been placed in front of you. If that is even approximately right, then the most consequential question about your own mind is not what you believe but what images are in circulation there and where each of them came from. Most of them will turn out to have been put there by someone. That is not a conspiracy. It is what happens when the traffic in images becomes an industry, and it is the situation Bruno described the mechanism of four hundred years before anyone had the means to run it at scale.
Sources & References
- Couliano, Ioan P. (1987). Eros and Magic in the Renaissance. University of Chicago Press.
- Bruno, Giordano. De vinculis in genere, the treatise on bonds.
- Ficino, Marsilio. De vita libri tres, on the health and regimen of the scholar.
- Yates, Frances. Giordano Bruno and the Hermetic Tradition, the reading Couliano departs from.
- Medieval and Renaissance treatments of pneuma and the phantasmic faculty.
- Anton, Ted. Eros, Magic, and the Murder of Professor Culianu, on his death.