The fact that a door appears to have the same shape whether we look at it from the side or front-on is an example of what is called a perceptual constancy.

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Perceptual constancy refers to the tendency of our perceptual system to perceive certain objects as unchanging despite changes in sensory input (such as changes in viewing angle, lighting, and distance). The example of a door appearing the same from different angles illustrates shape constancy, which is one type of perceptual constancy.

The Fact That a Door Appears to Have the Same