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Top 10 il­lu­sions facts

Selected as the most interesting among optical illusions related questions in
Optical illusions quiz
Which continent is that?
Australia. This is Australia map, with north at the bottom side.
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continents facts
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Which shape is larger?
None of them. Both shapes are the same, but the bottom one is placed more to the right. This is however difficult to notice. It is known as Jastrow Illusion.
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geometry facts
Which lines are parallel?
Green, blue and red. This is a well known Zöllner illusion, first described in 1860. It may be caused by this impression of depth. The black lines are parallel, too!
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technology facts
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