I argue in this paper that ordinary experience is not only a nice part of everyday life; it is a necessity for the development of human knowledge. I begin by looking at why the particular biological machinery that defines our nervous system matters. I then examine the particular machineries that constrain but also foster the development of human knowledge. Finally, I examine the kinds of activities that foster the development of knowledge, given the constraints of the given machinery, and conclude that activities that are repeated often and that involve meaningful interaction with an inherently meaningful environment form a plausible basis for the formation of knowledge within the particular neural net machinery that evolution has produced for us.