We seem to exist in a world of three-dimensional objects moving through space in regular ways, objects that are outside us and would continue to be there even if we weren’t looking at them. Some of these objects are people, some are animals, some are plants, and some are just stuff. Some of the objects are similar to one another, and some are different. And yet all of this banal, everyday experience is somehow based on tiny events on the edges of our bodies, photons bombarding our retinas, molecules of air vibrating at our eardrums, flickers of pressure on our fingertips. How do we bridge this apparently insuperable gap between our rich everyday experience of the world and the impoverished information of our senses?