With respect to vision,what exactly is constant in perceptual constancy?

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Perceptual constancy refers to our ability to perceive objects as maintaining their size, shape, color, and brightness even when viewed from different angles, distances, or lighting conditions. The physical environment and the retinal image constantly change, but our perception of the environment remains relatively stable due to perceptual constancy. Monocular cues, such as linear perspective, overlap, and texture gradient, help us perceive depth and distance, but they are not necessarily constant over time or across different environments.

With Respect to Vision,what Exactly Is Constant in Perceptual Constancy