Which is the best explanation for the visual illusion known as the Ames room?

The Ames room is a powerful visual illusion explained by the misapplication of size constancy. Size constancy is our tendency to perceive an object as being the same size, regardless of the changing size of the image it casts on our retina as it moves closer or further away. The Ames room is cleverly constructed to look like a normal rectangular room from a specific peephole, but it is actually a trapezoidal shape. Because we assume the room is rectangular, we misinterpret the retinal images of the people inside. We perceive the person in the further, larger corner as tiny, and the person in the nearer, smaller corner as giant, because our brain is holding onto the idea that they are at the same distance from us.