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Muller-Lyer illusion. Vector graphic optical illusion. The two horizontal lines are exactly the same length, but the inward and outward pointing arrows make the lower line look shorter
Ehrenstein illusion. Vector graphic optical illusion. The eye sees circles, but none actually exist.
Middle age hispanic woman listening to music wearing headphones over isolated background clueless and confused expression with arms and hands raised. Doubt concept.
Ambiguous concept word cloud background
Skyes oblique grating. Vector graphic optical illusion. The blue lines appear to be diverging at random angles, but they are perfectly parallel
ambiguity word in a dictionary. ambiguity concept.

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