To me it is truly remarkable that on a single sheet of paper one can write down the laws that govern all known physical phenomena, covering forty-three orders of magnitude, from the farthest reaches of the cosmos over 10 billion light-years away to the microworld of quarks and neutrinos. On that sheet of paper would be just two equations, Einstein's theory of gravity and the Standard Model. To me this reveals the ultimate simplicity and harmony of nature at the fundamental level. The universe could have been perverse, random, or capricious. And yet it appears to us to be whole, coherent, and beautiful.