Stories by Hans Wallach

We perceive our surroundings as stable in spite of the relative motion given the environment by our own movement, because the perceptual system can compensate for such displacements

What makes a surface gray and why does it stay gray even when the illumination changes? Apparently the ratio between adjacent light intensities governs the perceived lightness of an achromatic color

Relativity of motion furnishes the chief clues to the perception of it, yet we ascribe motion to objects as if they had acquired an absolute quality. This way of perceiving plays strange tricks