Is size circular ? If physics discovers that A is composed of B, and B of C, this would be a typical reductionist view A -> B -> C. Now imagine that at the planck level C ends up being composed of a smaller A, and the above loop goes on forever. If you were at any given size level you could say A is composed of "a smaller" A and is encolsed within a "larger A". But if the 2 As are identical except for size and the loop goes on forever, then A would really simply be composed of itself. You couldn't distinguish between the larger and smaller, they are relative and an infinite "recursive" like loop. Then an easy way out would be to think of the sizes like points on a circle. If you keep on going along the circle you will get back to the point you were at. So maybe size levels are like this, if you keep on getting smaller you get back to the original size. It is a bit like an inversion in space, at a certain point even though you seem to be getting to smaller items, you are actually going back up to larger ones. So maybe particle physics will end up being composed of circular sizes, just like the earth is round and if you walk straight you can get back to where you started, so reductionism could be like this. And maybe even explanations in general and time and many other things like "irreducible" complexity could end up being circular, self-composed, within an infinite recursive loop. An ultimate elementary particle is made up of itself and enclosed within itself, a monolithic slab.