The document discusses several key topics in perception including selective attention, perceptual organization, depth perception, perceptual constancy, and perceptual set. Specifically, it addresses how perceptual organization involves grouping stimuli into meaningful wholes based on Gestalt principles like proximity, similarity, and closure. It also describes how depth perception allows us to see objects in three dimensions using both binocular and monocular cues like retinal disparity, relative size, and linear perspective. Finally, it discusses the concept of perceptual set and how prior knowledge and expectations can influence what we perceive.