I love marbles. They are pleasant to hold and they make a good noise when you rattle them around. They look like they are made of pure color, compressed and contained beneath a tiny, shiny surface. They are totally unassuming in their beauty, modest infant moons, perfect little planets. When you find one on the sidewalk it is as if you have stumbled upon a pocket-sized replica of the world, or the residue of a magic spell. And - if you have synaesthesia - they are ideal for arranging your thoughts.