If there is one thing I admire about the diagonalists and other denizens of the Mirror World, it’s that they still believe in the idea of changing reality, an ambition that I fear too many on this side of the glass have lost. We shouldn’t make up facts like they do, but we should stop treating a great many human-made systems—like monarchies and supreme courts and borders and billionaires—as immutable and unchangeable. Because everything some humans created can be changed by other humans.

