William of Ockham was a fourteenth-century logician and Franciscan friar in England. He came up with the lex parsimoniae, or the law of succinctness, which says entities should not be multiplied beyond necessity. Occam's razor, as it came to be known, states that when given two equally valid explanations for a phenomenon, one should embrace the less complicated. Or, as architect Mies van der Rohe famously said, "Less is more."