- perception is the process of recording data from the physical universe and storing it as a theta facsimile. (HFP, p. 181)
- channels through which one can contact the physical universe. (SA, p. 64)
- any means of communicating below the level of knowingness. There are more than fifty perceptions used by the physical body, the best-known of which are sight, hearing, touch, taste and smell. (COHA Gloss)