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Relative size does matter: Animals see optical illusions
1Centre for Neuroscience, Indian Institute of Science, Bengaluru 560012, India.
Journal of Biosciences
|February 24, 2026
Abstract
None:
Consider the classic Ebbinghaus illusion in figure 1: the orange circle on the right seems bigger, even though both orange circles have the same size. Such size illusions occur in the real world too: in fact, a common dieting trick is to serve the same food on a smaller plate, which makes it appear larger, so you end up eating less. Why do we get fooled by such size illusions?
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