Sartre explains the theory of existential psychoanalysis in this treatise on human reality.

Describes the various senses as sensory systems that are attuned to the environment. Develops the notion of rich sensory information that specifies the distal environment. Includes a discussion of affordances.

Describes the changing sounds of the rain, the slow soft sprinkle, the drip-drop tinkle, the sounding pounding roaring rain, and the fresh wet silent after-time of rain.