Size Constancy

Size Constancy is the tendency to perceive an object as being the same size regardless of whether it is close or far away. For example, when we view a city skyline in the distance, we know the buildings are very tall, even though when we hold our hand out in front of the skyline the distant buildings are tiny compared to our hand. We still perceive the buildings in the background as tall because we know that they are far away and deep in our visual field, based on cues in our environment.