■■ The carpentered world theory suggests that people in urbanized, industrialized societies are used to seeing things that are rectangular in shape and unconsciously come to expect things to have squared corners because much of their world is carpentered (e.g., houses, buildings, etc.). If we see a house from an angle and light reflected off it does not form a right angle on the eye, we still perceive it as a house with square corners. In the Mueller–Lyer illusion, we tend to see the figures as having square corners that project toward or away from us. We know that things that look the same size to our eyes but are at different distances are actually different in size.