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Similarity is the tendency to perceive things that look similar to each other as being part of the same group. It has to do with perception. ! 0 5 years ago
Size constancy is the tendency to perceive objects as staying the same size, despite changes in your distance from an object. When an object is near to you, its image on the retina is large. When that image is far away from you, its image on the retina is small.