A significant portion of the work is dedicated to the anatomy and physiology of the primate visual system.

is a foundational work by Ian P. Howard that serves as a definitive technical review of the biological and psychophysical processes allowing humans and animals to navigate a three-dimensional world.

The book emphasizes "experience-dependent" neural plasticity—the idea that the brain's visual circuits must be "tuned" by environmental stimuli during early development to function correctly.

The book outlines the precise behavioral and analytic procedures used to measure how subjects respond to visual stimuli, establishing the rigorous scientific standard for modern depth research. The Biological Machinery of Vision

The text follows the visual signal from the eye through the Lateral Geniculate Nucleus (LGN) to the visual cortex. It pays specific attention to the columnar organization of the cortex, which is specialized for depth-related processing.

Howard explores how the brain translates raw light signals into meaningful geometric representations of space.

Howard provides a comprehensive review of how depth perception matures from the embryonic stage to post-natal life.

Howard details historical display systems like panoramas, peepshows, and the invention of the stereoscope, which first allowed humans to artificially simulate depth.