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Facts, science and history of optical illusions.
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The history of optical illusions in art

Which one leans more?

Source/credit: Informacyde

The photos are identical. That the right tower seems to lean more is nothing but an optical illusion.
This illusion is a distortion type, like the Jastrow illusion. These illusions trick the brain into perceiving differences in size, shape, or curvature due to surrounding context.