n order to perceive object constancy, your brain needs to understand the relationship between the object and one other factor. In the case of size constancy, you understand that the car you see approaching is not changing shape, so the other factor must be the angle at which you are viewing the car. glowing and getting brighter, so the other factor must be how much light is reflected from the car and its background. actually changing color, so the other factor must be the wavelengths of the light reflected from the car. actually growing larger, so the other factor must be how far away the car is from you