■■ The symbolizing three dimensions in two theory suggests that people in Western cultures focus more on representations on paper than do people in other cultures and spend more time learning to interpret pictures. Thus, people in cultures that use less paper, computer screens, and anything else that represents the world on a two-dimension plane may be less likely to be fooled by the Mueller–Lyer illusion because it is less familiar to them. They may be more fooled by the horizontal–vertical illusion, however, because it is more representative of their lifestyle.