Perception Laws

Size constancy is the tendency of objects to keep the same apparent size even as they approach us or move farther away. 

Both men appear to be the same size even though one is closer than the other,

Shape constancy is when the shape of an object does not appear to change regardless of that object's orientation.

Both shapes are orientated differently but we know it is the same shape

Brightness constancy is the recognition of color stays the same regardless of how it looks under different brightness of light

Both the middle boxes look the same even though the background colors are different.