Oh, and by the way, the universe is made of fields, whatever those are.

Quantum physics is reductio ad absurdum ... which is experimentally verified, so nature is absurd, not rational at all.

The problem is downward infinite regress ... A is made of B is made of C ... no end to it. Ultimately any explanation (which is what this is) is built on ignorance of what comes next. Human knowledge and understanding are ... word games about things people have no wisdom about. Better than nothing of course. Electrical engineering works, even if you can't spell quark.

This is true in mathematics ... Euclid's axioms are useful, and as corrected by David Hilbert circa 1900, are consistent. But nature isn't Euclidean as Einstein proved in 1905 and 1915. Mathematicians are still working hard, but can't actually define what mathematics is (that would require a fundamental theory of mathematics). One most recent attempt is Homotopy Type Theory in 2013, though quite a few mathematicians think it is inadequate.

This goes well with the cartoon at the top of the page regarding physics. We are better at unified field theory than Thales or unified mathematics than Pythagoras, but what is really outlined isn't what we know, but what we don't know.