Fig. 3

The classic picture of a Dalmatian dog sniffing the ground covered by patches of snow often used as a demonstration of the principle of ‘emergence’ in Gestalt psychology. Note that while most people typically initially struggle to make sense of the image, once they do, they will forever after immediately ‘see’ the dog in the picture. Reproduced from Marr ([40]; p. 101, Figure 3-1)