 What is the nature of sounds under the wave theory? Relevant to our purposes, there are two main metaphysical conceptions about waves, in both cases construed as individuals. Either (a) waves are considered to be of the same nature as processes (temporally extended entities, with temporal parts), or (b) they are taken as individuals of a peculiar kind. In case (a), it may be argued that they do not move, for arguably processes do not move (Dretske 1967), but rather have phases (temporal parts) located at different spatial regions. Although we do say that the party moved from John’s room to Mary’s room, the party was never fully in either room. Objects like people (John, Mary, Sue, Lynn), on the other hand, were completely in John’s room first, and completely in Mary’s room later. Objects and people moved, as movement occurs whenever a whole entity is fully first in a place and then in another. The party did not move, but part of it was in John’s room and part of it in Mary’s at different times.