The bicycle was black before it was white. It lay on the pavement behind Alan Nakagawa’s house in Los Angeles’ Koreatown neighborhood. An English-style cruiser, it had fenders, a swept-back handlebar, and a wide leather seat. Nakagawa and two friends, Isaiah and Julio, got busy, pulling off the tubes and tires, disassembling the brakes, sanding the frame. Nakagawa is an artist who primarily works with sound, but on this evening his medium was paint—two cans of white Krylon ColorMaster.