Pertaining to the quality of human perceptual experience (including sight, sound, smell, touch, taste, and movement) evoked by phenomena or elements or configurations of elements in the environment.
Schwarz, Charles F.; Thor, Edward C.; Elsner, Gary H. 1976. Wildland planning glossary. Gen. Tech. Rep. PSW-13. Berkeley, Calif.: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station