Why Do Shapes Feel Different Under Your Touch?

Shapes feel different because they have different edges. A square has corners, which stick out and poke your skin more than a smooth circle. Think of it like this: if you draw with a ruler, the lines are sharp, but if you use a round pen, it feels softer.

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Examples

Touching the corner of a book feels more pointed than touching a ball.
Walking on gravel feels different from walking on a smooth road.
Folding paper by hand gives you a sharp edge, while rolling it makes it smooth.

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Categories: Math · geometry· touch perception· math and physics