The EyeTap glasses of the previous chapter absorb and quantify rays of light, process these rays of light, and then resynthesize corresponding rays of light. Each synthesized ray of light is collinear with, and responsive to, a corresponding absorbed ray of light. The exact manner in which it is responsive is the subject of this chapter. In other words, this chapter provides meaning to the word “quantify” in the phrase “absorb and quantify.