Coel has a post over at his blog:
I thought of posting a comment there. But I then decided that it might be worth a full post.
Coel’s view
Coel quotes Feynman, as suggesting the atomic theory of matter as particularly important. But Coel seems to disagree with this. The trouble with atoms, is that they are made of subatomic particles. In turn, quantum mechanics has something to say about those subatomic particles that makes them look less particle-like.
Coel delves down to a number of possibilities. He even mentions Tegmark’s idea that everything is made of mathematics. But Coel himself is not so certain that we can give a good answer at this, or perhaps ever.
I do recommend reading his post.
Searle’s view
I have recently been rereading Searle’s perception book. And he discusses the same question:
One of the most fundamental distinctions among philosophers and types of philosophy, perhaps the most fundamental distinction, is in their answer to the question of what the philosopher regards as ontologically rock bottom. That is, for any philosopher who is willing to work out the implications of his philosophical position, there is an answer to the question, “What, if anything, is that in terms of which everything else has to be explained, but which does not itself have to be explained in terms of something else?” On the account that I have been giving you in this book, it is clear that rock bottom is the world as described by atomic physics.
(p. 222 of “Seeing Things as They Are”)
My own view
As I see it, the world is made of stuff. And we cannot really say what that stuff is, which is why I call it “stuff”. We then divide that stuff up, and give names to some of the divisions — names such as “cat”, “table”.
Philosophers describe this as “carving the world at its seams”. But I don’t think there are any seams. We carve up the world in ways that are easy enough or at least doable by us, and such that our way of carving up the world gives results that are useful to us.
We can see some of this in our history and experience. The classical explorers carved up the planet at rivers and mountain ranges. But, if we were doing that today, we would carve it up in accordance with GPS coordinates. Our technology has given us better ways of carving up the world, and we use those.
My conclusion can only be that the structure we see in the world depends on us. It depends mostly on our biology, but it also depends partly on our culture and technology. And so the structured components that we see should not be considered fundamental.