Quantum Mechanics - Is the Wave Function Really Important?

The laws of physics of the universe have really weird and surprising gauge symmetries, much more than you would expect. And they have real consequences, like we talked about, every time, there's a symmetry of the universe that leads to a conservation law. This is not just like an arbitrary thing we write down in our rooms with pencil and paper. It's something deep about the universe that respects this symmetry.