Brightness constancy is where we perceive an object to have the same lightness despite varying illumination of the object. For example, if a black paper is viewed in direct sunlight and in a dim room, it will still be perceived as black in both rooms even though there is a large difference in lighting on the paper. Brightness constancy is based off of the context of surrounding objects, as is demonstrated in the above image. Even though there is a different amount of brightness on each bowl of fruit, we still perceive the fruits to be their proper color. Your perceived brightness will change with context.
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