If you rap your knuckles against a window jamb or door, if you brush your leg against a bed or desk, if you catch your foot in a curled-up corner of a rug, or strike a toe against a desk or chair, go back and repeat the sequence. You will find yourself surprised how far off course you were to hit that window jamb, that door, that chair. Get back on course and do it again. How can you pilot a spacecraft if you can't find your way around your own apartment?

William S. Burroughs