Why does vision provide much of the information people use to perceive space?

Vision is the primary sense humans use to perceive space because it functions as a distance sense, capable of supplying information from extremely far points in the environment, unlike proximal senses such as touch or taste that require direct contact. While other senses like hearing and smell also provide distance information, their range is considerably more restricted than that of vision.1

The human visual system processes spatial information through several sophisticated mechanisms:

• Binocular Disparity: Because the eyes are positioned at different points in the skull, they receive slightly different images of the same object. The brain interprets this disparity as a three-dimensional experience, which is particularly effective for perceiving depth in near space.2
• Monocular Cues: Even with one eye, humans can estimate depth using cues such as perspective, light and shade, the overlapping of contours, and the relative sizes of familiar objects.32
• Movement Parallax: When an observer moves their head, nearby objects appear to move more than distant ones, providing critical information about depth and distance.2

Ultimately, vision dominates human spatial perception because it allows for the integration of these complex cues into a stable, three-dimensional understanding of the world.14