"Hermann Weyl was both a mathematician and a mathematical physicist. Weyl wrote on mathematics, general relativity... quantum mechanics... art and philosophy. His smaller book on philosophy is entitled The Open World. It is made up of lectures... in 1932 at Yale University. In the philosophy of science, according to Weyl, complexity is essential in understanding the concept of a law of nature. If laws of nature may be arbitrarily complex, he argued, the very concept... becomes vacuous. What difference would remain... if the laws meant to explain them were as complex as the phenomena they are meant to explain? Laws of nature must be simple."