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 our ability to see objects as appearing the same even under different lighting conditions, at different distances and angles, or when their context changes. This phenomenon allows us to perceive the shape, size, and color of objects as constant even when the angle of observation, distance, or lighting changes, as in the case of a door appearing to retain its shape whether viewed from the side or front-on.

The Fact That a Door Appears to Have the Same