Size constancy is the ability of people perceiving objects to have the same size even though the retina perceives them to be of different size (Boring, 1964). In the size constancy tutorial accessed from the Hanover website, different photographs have been show to demonstrate how objects with different sizes are perceived to be of the same size. The first photograph has people who appear to be of the same size. However, the second photograph shows that the people are of different sizes.
The eyes not only see but make interpretations on the basis of what is presented in the visual environment. In the photograph, when the figure in the white shirt was moved to the people in the foreground, the illusion that the people had the