Amazing illusion: The orange circle doesn't actually change size. Optical illusions are fun, but they're also a reminder that we don't directly perceive the world around us. Perceptual experience is a simulation, which doesn't always correspond to the reality it aims to depict.pic.twitter.com/AT4JP4LcbR
Replying to @SteveStuWill
Also that our perceptions are influenced by context; the orange circle is (mis)perceived relative to what's around it.
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