Before revision: This chapter derives the properties of light from the properties of processing, including its ability to be both a wave and a particle, to detect objects it doesn't  touch, to  choose a route after it arrives, to take all paths to a destination and to spin in any direction both ways at once .
After revision: This chapter derives the properties of light from the properties of processing, including its ability to be both a wave and a particle, to detect objects it doesn't touch, to choose a route after it arrives, and to spin in any direction both ways at once .