Ch 10: Discussion of space and time in the brain. Makes the interesting case that these are concepts derived from measuring tools and that the brain does not have centralized, internal mechanisms for tracking either. Neurons and neuronal groupings can track firing rate but these are self-referential and do not rely on an internal “clock.” Space is tracked by grid cells and place cells but these do not calculate distance. Rather, the brain sees space and time as equivalent, and will come up with ways create reference objects within local surroundings for either, as demonstrated by a variety of indigenous cultures that do not use formal metrics.