The mind craves ease; it encourages the senses to recognize symbols, to gloss. It makes maps of our kitchen drawers and neighborhood streets; it fashions a sort of algebra out of life. And this is useful, even essential - X is the route to work, Y is the heft and feel of a nickel between your fingers. Without habit, the beauty of the world would overwhelm us. We'd pass out every time we saw - actually - a flower...'Habitualization,' a Russian army-commissar-turned-literary-critic named Viktor Shklovsky wrote in 1917, 'devours works, clothes, furniture, one's wife, and the fear of war.