The fact that we perceive a door to be a rectangle at any angle and that we perceive an airplane as relatively the same size no matter how far away it is, reflects the operation of

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These phenomena are examples of perceptual constancies, where our perceptions of objects remain relatively unchanged despite changes in the angle of perception, distance, and lighting. This allows us to perceive the shape and size of objects as constant even when the retinal image changes.

The Fact That We Perceive a Door to Be a Rectangle