I arbitrarily defined an arbitrary mathematical structure

[napoleon_in_rags]

6. I saw a good youtube talk by Roger Penrose, where he eluded to that.

It was a passing comment, about how the complex numbers were created out of thin air in the past, but now we know (especially via Quantum Mechanics) that they are critical to the way the universe works. The way he said it struck me, like he considered it almost downright suspicious that this would be the case.