Mind, Matter and Kepler: Where Does the Mind End?

A Buddhist teacher sits across from Rupert Sheldrake and admits to something most spiritual practitioners would rather keep quiet. After years of meditation, a month of solitary retreat in the mountains of Spain, and a daily walk to the end of a valley to look at the goats, the teacher still feels, at moments, that the world outside the body is alien. If they died on that mountain, the rocks and trees would not care. Their consciousness would simply be switched off. The conversation, recorded at PhilosophyEAST and published by the London Buddhist Centre in January 2025, begins with that confession and then asks a harder question: where did this feeling come from, and is it a fact about the universe or a story we inherited?

What is "metaphysical materialism," and why does a meditator still feel it?

The host frames the problem with a phrase borrowed from philosophy. Charles Taylor, the host notes, wrote about "exclusive humanism," a bounded picture in which there is nothing beyond the mind. What makes the retreat moment interesting is that the host does not experience this as an idea they hold. It is a background assumption that persists after years of practice. "I was struck by how deeply I've still got that idea that here who I am me is the only bit of the world that's there," the host says, describing the sense that the self stops at the edge of the skin and everything beyond it is inert and unrelated.

The host then pushes the point further. If the outside world is alien, it can be fracked, mined, and used as a rubbish dump, because it is not alive and "soon I won't be alive." Put that way, the feeling is not only private. It has ethical consequences. A cosmos stripped of interiority is a cosmos with nothing to lose.

The host also traces the feeling back to childhood. At around eight years old, they were taken to see their dead grandmother. Told she was "asleep," they knew she was not, and when their father said she had "gone to a better place," they could see no evidence for that either. What stayed with them was less the loss than the realisation that the adults did not know what had happened. "This is a major problem we've got here," the host remembers thinking, and nobody seemed to be aware of it.

How did Kepler's theory of vision help split mind from nature?

Sheldrake's answer begins in the seventeenth century, with an astronomer better known for planetary orbits than for the eye. "Since the beginning of modern science in the 17th century," he says, "there has been this attempt to separate minds from nature." The separation, he argues, runs through the whole structure of modern science and is tied to the Cartesian dualism that divided thinking substance from extended matter.

The hinge, in his account, is Johannes Kepler's theory of vision. Kepler worked out that light enters the eye through the lens and forms small, inverted images on the retina. Sheldrake is careful about the prehistory. People had been making spectacle lenses in the Middle Ages, and the camera obscura, a darkened room with a pinhole, already produced an inverted image on a wall. Kepler combined these observations and explained what was happening inside the eye.

What makes this a story about mind rather than optics is what came before it. Sheldrake explains that in ancient Greece, and in common sense everywhere, people believed that the images we see are located where they appear to be. My picture of you sits where you are sitting. He notes that children tend to believe this too. The geometer Euclid worked out a different model in which the eye projects visual rays outward, so that perception is an active reaching into the world. Sheldrake's gloss on this older view is blunt: "every Act of perception links me to the world around me."

"Before the 17th century... everyone more or less took it for granted that we're connected with the world. We're not just inside our heads." (Rupert Sheldrake, PhilosophyEAST, London Buddhist Centre, January 2025)

Kepler's model put the action inside the head. Light comes in, changes happen in the brain, and nothing goes out. The trouble was that people did not experience two small inverted images of the world. They experienced one image that seemed to be out there. Sheldrake's account of Kepler's response is one of the most revealing moments in the talk: the astronomer, he says, could not explain this and considered it outside his business. "It's not my business. I'm doing optics," Sheldrake reports Kepler as essentially saying. The explanation was left to "someone else," and the gap has never been closed.

Why did Galileo's distinction between qualities matter so much?

The split was completed by Galileo, Sheldrake argues. The external world, in this picture, is made of physical matter with measurable properties like mass, weight, and momentum. Those are the primary qualities. Colours, smells, and tastes, by contrast, were demoted to secondary qualities that the mind supplied. The consequence was that the most vivid parts of experience were moved inside the skull, and the world beyond it became a silent arrangement of quantities.

"They're secondary qualities smells colors they're not out there in the world they're inside the head." (Rupert Sheldrake, PhilosophyEAST, London Buddhist Centre, January 2025)

This is where the host's retreat experience and the history meet. The feeling that the goats are interesting but the rocks are not, that the world is dead and I am the only live thing in it, is exactly what a Galilean-Keplerian picture would predict. The inner life is confined to a brain; the outer world is mass in motion. Sheldrake is not suggesting that anyone consciously chose this. He is describing a framework that quietly became common sense, so that a meditator who has spent decades practising non-dual insight can still find it running underneath the surface.

Why is consciousness still a "serious problem" for science?

The talk does not resolve the question in its first stretch, and it would be unfair to pretend it does. What it does show is why the question keeps returning. Sheldrake's point is that the mind-body split was never a neutral finding. It was a methodological decision that made certain questions hard to ask. When the mind is pushed inside the head, consciousness becomes a puzzle about how a brain produces experience, rather than a feature of how we are connected to the world. The question "where is my experience?" gets answered with "inside me," and then cannot explain why the experience appears to be out there.

The host's childhood question, what happens when we die, sits on the same fault line. If consciousness is locked inside the brain, death must be oblivion. If the mind is connected to the world in the way the older optical theory suggested, the story becomes less obvious. Sheldrake's wider work, including his best-known hypothesis of morphic resonance, has consistently argued against the materialist dogmas he sees as underpinning modern science. The description of this event frames the aim plainly: to explore "where contemporary thought and ideas have some degree of coincidence with the Buddhist vision." The conversation takes that intention seriously. A Buddhist framework that already speaks of dependent arising and the non-separateness of self and world has a natural interest in an account of perception that refuses the sealed-skull picture.

What should a reader take from this conversation?

The most useful thing about this talk is that it treats a metaphysical assumption as a historical artefact. You do not have to accept Sheldrake's conclusions to see the value of the history he lays out. Kepler's inverted images were a real discovery, and they were also an incomplete one. Galileo's distinction gave science powerful tools, and it also left the experiencing subject with nowhere to stand in the world it describes. The host's retreat walk shows how that inheritance feels from the inside: ordinary, unexamined, and very hard to shift even after years of practice.

For readers coming to this through meditation or philosophy, the value is in the questions. Where do you locate your perception? Does the outside world feel alive or inert in your own walks? And when you hear that consciousness is "a serious problem" for science, which part of the problem do you think is real?

Where to go from here

The full conversation runs about an hour and twenty-six minutes, and this article has concentrated on its opening stretch, where the historical argument is laid down. The later portion takes up the evidence Sheldrake cites from his own research programme, and readers who want that material should watch the talk directly rather than rely on a summary. The London Buddhist Centre's PhilosophyEAST series is a good entry point into related conversations on how contemporary thought meets the dharma, and the centre's website at londonbuddhistcentre.com lists its classes, courses, and retreats for anyone who wants to test these questions in practice rather than in argument alone.