A part of the house is cast in a shadow from a passing cloud, yet our brain perceives the house as all blue it demonstrates Perceptual constancy.
Subjective constancy or perceptual constancy is that the perception of an object or quality as constant even though our sensation of the object changes.
While the physical characteristics of an object might not change, in an effort to deal with the external world, the human perceptual system has mechanisms that suits the stimulus.
Perceptual constancy is classified into these categories: brightness, shape, size, and color. Shape constancy is the perception of an object's shape by someone who is familiar with it, regardless of changes in its position or orientation.
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