What is size constancy and examples?

Size constancy is a perceptual phenomenon where the perceived size of an object remains relatively constant, despite changes in the distance from which it is viewed. For example, a car appears the same size to a person standing close to it as it does to someone viewing it from a distance, even though the retinal image size differs. This ability helps us accurately interpret the size of objects in our environment, contributing to our spatial awareness. Another example is recognizing that a person walking away appears smaller, but we still understand they are the same size as when they were closer.