A Manifesto for Presence It has neither beginning nor end, but always a middle from which it grows and which it overspills. — Deleuze and Guattari, A Thousand Plateaus There is a Victorian parlor toy called a thaumotrope. It is among the simplest optical devices ever made: a disc with an image on each side and a string threaded through opposite edges. A bird on one face, a cage on the other. Spin the string between your fingers, and the disc becomes a blur. The bird appears inside the cage.
This is the cheapest magic trick in the history of optics. You can make one from cardboard and rubber bands. Children understand it immediately. And yet it contains, in its primitive mechanics, the deepest truth I know about presence, embodiment, and what it means to design experiences for human beings who live in bodies.
The bird and the cage are on entirely distinct sides of the disc. They never touch. They never occupy the same surface. There is no moment at which both images are visible simultaneously. And yet the bird is in the cage. Not because the images have merged, but because the disc is spinning. Stop the motion and you have two inert pictures. The thing you came to see—the bird inside the cage—exists only in the spinning. It is produced by neither image alone. It lives in the verb, not the noun.
I have turned this toy over in my mind for years, and I keep finding new faces on the disc. * * * Here is the first face: time. Place the past on one side and the future on the other. The present is not a slice between them—not a line on a timeline, not a dimensionless instant through which events are processed like tickets through a turnstile. The present is the spinning. It is the activity that fuses what has been with what is becoming into the experience of now. Stop the disc and you have memory on one side, anticipation on the other, neither of them inhabited. We do not live in the past or the future. We live in the motion that makes them cohere.
This is not metaphysics. It is phenomenology at its most basic. Husserl spent a career trying to articulate the time-consciousness that constitutes the living present, and his best formulations—retention, protention, the primal impression—are diagrams of a spinning disc. The note you just heard is already past. The note about to sound is not yet present. Music exists only in the retention of what has just passed and the anticipation of what is about to come. The melody is the spinning.
Here is the second face: embodiment. Place the mind on one side and the body on the other. They are not the same thing, and they do not merge into some mystical unity. Descartes was not entirely wrong to notice that thinking and extension feel different. But he was wrong to conclude that they are separate substances. They are opposite sides of the same disc, and the lived experience of being a person—of being a creature that thinks while it breathes, that reasons while it digests, that philosophizes while its knees ache—is the spinning.
Merleau-Ponty spent his life trying to articulate this. He called it the chiasm, the intertwining, the flesh of the world. He kept insisting that seer and seen are not the same thing and not different things, that they are like the two sides of a reversible surface. He was describing a thaumotrope. He just didn't have the toy.
But I had the toy because I had a banjo. Twenty years of playing an instrument taught me that knowledge lives in the body before it lives in the mind and sometimes instead of the mind. My fingers knew things my conscious awareness could not access. The music happened in the spinning between intention and muscle, between what I heard in my head and what my hands produced. When the spinning was good, there was no gap. When it stuttered, the bird fell out of the cage.
Here is the third face, and the one that brought me to this book: virtual reality. Place the physical world on one side of the disc and the virtual world on the other. The conventional wisdom about VR is that it works by immersion—that the goal is to spin the disc so fast that you forget there are two sides, that you believe you are somewhere you are not. The presence literature is full of this aspiration. Total immersion. Perceptual illusion. The disappearance of the medium.
I think this is profoundly wrong.
The power of VR is not that it transports you to one side of the disc. It is that it puts you in the state of spinning. You are simultaneously in your body and in a rendered world, simultaneously here and there, simultaneously physical and virtual. You are not in either place. You are in the oscillation between them. And this oscillation is not a failure of the technology or a weakness to be engineered away. It is the experience. It is presence.
A headset spins reality into a paradox, at once in your body, and disembodied, simultaneously nowhere at all astride the occupancy of two realms. I wrote that sentence years ago, in a thesis presentation that a professor dismissed without discussion. I did not yet have the thaumotrope to explain what I meant. But my body already knew it. * * * I learned to think this way before I learned to think. Which is to say: I learned it in Jewish day school, in remedial Hebrew classes, which was the greatest accident of my education.
Because I could not read Hebrew at grade level, I was given the texts in translation. This meant I could not simply recite. I had to engage with the commentary. And the commentary tradition of the Talmud is itself a thaumotrope—voices from different centuries occupying the same page, arguing with each other across time. The Gemara argues with the Mishnah. Rashi writes in the margins. The Tosafot argue with Rashi. Every page is a spinning disc on which the past and present and future of interpretation coexist in spatial simultaneity.
What I learned from this tradition was not a body of knowledge. It was a method. I learned to place two texts side by side—not to synthesize them into a single meaning, but to let the friction between them produce something that neither contains alone. This is what the rabbis call midrash: the practice of reading the gaps, the silences, the contradictions. It is reading as spinning. And it is what led me, inevitably, to the study of classics, where I found the Greeks doing something structurally identical with myth.
A woman weaves a peplos for the goddess. Into the fabric she weaves the stories of the gods. She carries it in procession through the city. She drapes it on the cult statue in the temple. And the goddess, wearing the garment that depicts her own history, becomes both the wearer and the worn, the subject and the object, the image and the frame that contains the image. The peplos is a thaumotrope. The ritual is the spinning.
Actaeon sees Artemis bathing and is transformed into a stag and torn apart by his own dogs. The hunter becomes the hunted. The seer becomes the seen. And the transformation is irreversible—not because the gods are cruel, but because seeing itself is a form of contact, and contact changes the one who touches. This is the ethical argument I have been building across every essay in this book: that immersive experience is not entertainment. It is somatic training. And somatic training cannot be undone. * * * I learned the stakes of this argument in a building I had never entered.
The Hotel Chelsea was the dream of Philip Hubert, a devotee of the socialist philosopher Charles Fourier, who envisioned a structure modeled on the Parisian palace—an intentional community with shared open spaces, gardens, and galleries that supported the arts and emphasized the greater good. For a century, the dream held. Under the management of Stanley Bard, artists could stake their work in place of rent. The building became a thaumotrope of its own: utopian aspiration on one side, bohemian reality on the other, and the spinning between them produced one of the most extraordinary concentrations of creative output in the history of a city that specializes in such concentrations.
Then the building was sold. Stanley was fired. The dream stopped spinning.
I found the Chelsea Hotel in virtual space before I found it in physical space. Second Life had its own Chelsea Hotel, built in the vision of the original, populated by poets and artists over fifty, widowed, sick, lonely, who had constructed their bohemian utopia in the only medium still available to them. I walked its corridors in a headset, already experiencing the déjà vu of a place I had never been, already spinning between the physical building I had not yet visited and the virtual reconstruction I was exploring, between the utopian past and the digital present, between someone else's memory and my own emerging one.
When I finally stood on West 23rd Street, trembling before the scaffolded façade, I understood something about presence that no amount of theory could have taught me. Beholding my presence in the presence of this space was like déjà vu all over again. I had walked its corridors and rode its elevators in the dream of virtual space. In the dreams I dreamt of it, born from the dreams of others who had lived that dream, who were drawn there by some other dream before them, until the last turtle all the way down.
Here is what the Chelsea Hotel taught me: Time and space are not presence. They are interfaces of sensory experience. The mind is not bound by the same condition. It can absent itself from the body to enter non-space and non-time. Time and space are places you can go, but the body can only go forward in linear time.
When enough people share a dream, and seek ways to live in it together, they will build a utopia. They can share a memory palace. And they will try to build new ones.
But attempts will inevitably lead to devastation, and can slide into dystopia. Like a broken promise. And everything around you is just a reminder of that dream. And breaks your heart all over again.
This is not a warning against building. It is a description of the cost of building. The thaumotrope does not say: do not spin the disc. It says: understand that the bird in the cage exists only while you spin, and that when you stop, you will have two flat images and the memory of flight. * * * There is a 1993 adventure game called Day of the Tentacle that taught me more about narrative architecture than any course I took in graduate school.
The game features three characters in three time periods—past, present, and future—all occupying the same location: a mansion. The characters can pass objects to each other through time via toilets repurposed as time machines. Actions in the past alter the future. A bottle of wine buried in a time capsule two hundred years ago becomes vinegar when retrieved in the present. The structure is a thaumotrope with three faces, and the game’s brilliance lies in its dependency graph: the network of puzzles that determines what the player can do and in what order.
The graph reveals something extraordinary. The game appears to be a single, unified, forward-moving narrative. But when you map the dependencies, you discover that it is actually three almost entirely isolated sub-plots that never reference each other. The character-switching mechanic—the spinning—creates the illusion of coherence. The player experiences the story as one thing because they are in motion between its parts. Each sub-plot is self-contained, with no internal reference to events in another sub-plot, which means the narrative remains coherent regardless of the order in which the player encounters it.
Over six billion possible orders. One coherent experience. Because the coherence is not in any single node. It is in the movement between nodes.
I did not understand, when I was obsessing over this game's design, that I was also building the architecture of the book you are now reading. Twenty-two essays. Each self-contained. Cross-dependencies that pass between them like objects flushed through time. And the argument—the bird in the cage—appears not in any individual essay but in your movement between them. You, the reader, are the spinning. I built you a thaumotrope and handed you the string. The reading is the presence. * * * The technical term for what happens when the frame breaks—when a character in a story becomes aware of the story, when an image on one side of the disc flickers into visibility as a separate image even while it fuses with the other—is metalepsis. And it is the engine of everything I design.
In a performing reality class at ITP, I designed an audio experience featuring three scenes—a first date, a wedding, and a funeral—each scored with an Elton John song. The same characters bled across the scenes. The same internal monologue format structured each one. And at the end of every scene, a character would say: “Isn’t it funny how Elton John ties this whole thing together?”
That line is metalepsis. It is a character inside the narrative acknowledging the structural device that organizes the narrative. It breaks the frame from within. And the audience, hearing it, experiences the thaumotrope flickering—suddenly aware of both sides of the disc, aware that the emotional weight of “Candle in the Wind” at a fictional funeral is produced by their own body’s memory of the song in other contexts, aware that they are simultaneously inside the story and outside it.
I tried to explain this to my professors using a simpler example: the fact that the Alphabet Song, “Twinkle Twinkle Little Star,” and “Baa Baa Black Sheep” share the same melody. Three different semantic frames, one musical body. Same structure as the Elton John piece. But nobody feels “Baa Baa Black Sheep” when they sing the ABCs. The shared melody is an intellectual observation, not a somatic event. There is no emotional freight to create the friction.
The failed example proved the thesis. The difference between the two cases is exactly the difference between knowing something conceptually and knowing it in your body. You can explain metalepsis with the nursery rhyme triad and people will nod. You can produce metalepsis with the Elton John piece and people will feel it. And you cannot communicate the difference through conventional academic presentation, because the explanation belongs to the epistemic category that doesn’t work.
Which is why I had to write a book. * * * So here is what I know, after twenty years of playing instruments and reading Torah and building prototypes and walking through other people’s dreams: Presence is not a place. It is a motion. The thaumotrope teaches this. The bird is not in the cage because the cage contains it. The bird is in the cage because the disc is spinning. Every immersive experience that tries to make the user forget they have a body is spinning the disc in the wrong direction. The body is not the obstacle to presence. The body is one side of the disc. Without it, there is nothing to spin.
Reading is already immersive. The Talmudic page—voices from different centuries arguing in the same space—is a virtual reality that has been operating for two thousand years without a single headset. What the commentary tradition understood, and what our industry has largely failed to understand, is that the power of immersion is not in the fidelity of the representation but in the density of the interpretive demand. A page of Talmud is more immersive than most VR experiences because it asks more of the reader’s body—more attention, more movement between frames, more spinning.
The designer is building a temple, not a theater. A theater asks you to watch. A temple asks you to be transformed. And transformation is irreversible. Actaeon does not get to un-see the goddess. The wearer of the peplos does not get to un-become the myth. When you design an experience that operates on the body—that trains the senses, that creates somatic memories, that alters the user’s relationship to their own flesh—you are not making content. You are performing a ritual. And rituals have consequences that outlast the ritual itself.
Non-linearity is not chaos. It is trust. The dependency graph of Day of the Tentacle proves that you can offer the player six billion possible paths through a narrative and still produce coherence—if you design each node to be self-contained and let the connections emerge through movement. This is the architecture of the Talmud, the architecture of a Miro board, the architecture of a mind that learned to think by placing two texts side by side and listening to the friction. The designer’s job is not to prescribe the order. It is to build nodes worthy of any order.
Utopia requires maintenance. The Chelsea Hotel was a dream that required a dreamer. When Stanley Bard was removed, the dream stopped spinning. Every immersive world, every virtual community, every shared memory palace is one administrative decision away from becoming scaffolding. This is not an argument against building utopias. It is an argument for understanding that utopia is a verb, not a noun. It is the spinning of the disc, not an image on either side. The moment you treat it as a destination rather than a practice, you have already begun to lose it.
The body remembers what the mind forgets. This is the title of this book and it is the only sentence I am certain is true. My fingers remember banjo patterns my conscious mind cannot reconstruct. My feet remember the choreography of rituals I performed decades ago. My nervous system remembers the vertigo of the first time I put on a headset and felt the floor drop away. These are not metaphors. They are the material substrate of presence. Every experience I have ever designed is an attempt to honor this fact: that the body is not a vehicle for the mind but a library with its own catalogue, its own circulation desk, its own overdue fines. You can return the book, but the reading has already changed you. * * * I began this work with a question I could not articulate. It lived in my hands before it lived in my head—in the muscle memory of banjo rolls, in the disorientation of entering virtual space, in the strange doubling of reading commentary on commentary on a text I could only access in translation. I have spent the intervening years building prototypes, designing rituals, studying myths, and writing these twenty-two essays in an attempt to give the question a form that might produce, if not an answer, then at least a more precise way of asking.
The question, as nearly as I can now articulate it, is this: What does it mean to build a world that someone else will inhabit with their body?
The thaumotrope says: it means you are responsible for the spinning. Not for what the user sees on either side of the disc, but for the quality of the oscillation between them. It means understanding that presence is not a state to be achieved but a motion to be sustained. It means knowing that the bird will never actually be inside the cage—that the magic is always in the spinning, never in the image—and building anyway, because the spinning is the most real thing there is.
It means accepting that when you stop, the bird disappears. And building something worth spinning for. — BIBLIOGRAPHY