«I cannot help mocking our unwavering certain-
ties. It is, for example, great fun deliberately to
confuse two and three dimensions, the plane and
space, or to poke fun at gravity. Are you sure
that a floor cannot also be a ceiling? Are you
absolutely certain that you go up when you walk
up a staircase?» — Maurits Cornelis Escher
WALL & CEILING L AMPS
