Seeing an open door as rectangular, even when we are viewing it from an odd angle and the image hitting our retina is more in the shape of a trapezoid, is an example of

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Shape constancy is the ability for us to perceive objects as having a constant shape even when the image hitting our retina is distorted due to viewing angle or other factors. This is what allows us to see an open door as rectangular, regardless of the angle it is viewed from. Bottom-up processing is the analysis of the features of an image to understand the overall picture, while preattentive processing refers to the unconscious identification of specific features in a visual scene. Motion parallax is the perception of motion in objects due to changes in their position relative to the observer.

Seeing an Open Door as Rectangular, Even When We Are