definition by deception, by subtraction, what is by what is not, glass half empty type of meaning, figuring out by holes in the wall, absense of space, bas relief, etched glass, providing depth and texture by removing, by the act of taking away, creation by destruction, how removal of a force causes motion, where in 2 bodies providing leverage, and one disappears, rapid movement ensues, and suddenly, things change, things happen, and away we go