 Our most basic concepts, our most basic coping strategies, are those we employ incessantly in the course of purposeful voluntary bodily movement executed in response to sense-perceptible features of things in our immediate spatial vicinity. These basic concepts sketch out a world of discrete objects and discrete parcels of various physical stuffs (substances), laid out in space and changing over time as the objects and substances in question come into existence, move about from place to place, and eventually go out of existence. They present this sensorimotor world to us from a particular determinate spatiotemporal perspective, and characterize it for us more or less as follows.