“Illusions are fun, but they are also a gateway to perception,” says Hyeyoung Shin, assistant professor of neuroscience at Seoul National University. Shin is the first author of a new study in Nature ...

An illusion is when we see and perceive an object that doesn't match the sensory input that reaches our eyes. In the case of the image below, the sensory input is four Pac Man–like black figures. But ...