This chapter argues that the future as potentiality is more fundamental than the future to be predicted. It describes the standard, positivistic psychological theory about memory that perception confines itself to the present, memory applies to the past, and expectancy or prediction applies to the future. The classical standard theory of perception seems to be based on Western metaphysics which has long been obsessed with describing reality as an assembly of static individuals whose dynamic features are either taken to be mere appearances or ontologically derivative. J. J. Gibson demonstrates that perception is not a representation of the environment, but information-picking-up process; namely, process of specifying invariants from the flux of stimulation by the perceptual system. Perception of depth is perception of the structure of world which has at the same time the present aspect and the latent aspect. Positivist theories of perception have claimed that depth cannot be perceived but only inferred or calculated.