This week I was a speaker at the Science of Consciousness Conference (University of Arizona). My 23-min talk is sort of an extension of the work of Donald Hoffman, a cognitive scientist (UC Irvine) who was also a presenter. Hoffman contends that the brain is an active player in perception. I take this idea and extend it, suggesting that the brain is designed to hew to the speed of light. The speed of light is time. If time slows down (if we are too dense), the brain will speed us up (Parkinson’s). If time speeds up (if we are not dense enough), the brain will slow us down (Lou Gehrig’s disease).