Human sense organs can receive only news of difference, and the differences must be coded into events in time (i. e., into changes) in order to be perceptible. Ordinary static differences that remain constant for more than a few seconds become perceptible, only by scanning. Similarly, very slow changes become perceptible only by a combination of scanning and bringing together observations from separated moments in the continuum of time.

p. 74-75 - Mind and Nature, a necessary unity, 1988