A program which does nothing, just opens and closes. It is a series of NOP instructions, which get reduced down to a single empty function. Written in photographs for the photograph-based Light Pattern programming language ( lightpattern.info ). Each image has the bare minimum content necessary for a NOP command: a photo of red pixels, green pixels or blue pixels. Because a NOP instruction requires the shutter speed to be faster with each image, the progression begins with white and progresses to black, at which point the compiler can no longer determine which color dominates.