You're looking at a simple, almost childish picture: a triangle divided into several parts. Everything seems obvious. You're asked, " How many triangles do you see? " and you confidently name a number. But when the correct answer is revealed, it turns out you were wrong.
This is a task most contestants on the British show Club 1% can't solve. Why is this riddle so tricky?
An optical trap that tricks the brain
These kinds of tasks are cleverly designed: they look easy. The brain notices only the most obvious shapes. But hidden within the shapes are triangles of three types:
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Small, easily visible triangles
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Triangles formed from two or three smaller ones are called “fused” triangles.
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The big triangle in its entirety , which many people forget about
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