What are the origins of shapes?

I understand basic geometrical shapes(squares, circles, lines, dots, etc.), but why was the five-pointed shape assigned to a star-when the stars in the sky look nothing like that? Same thing with the heart-shape. Why did people assign the upside triangle with two half circles on top to a heart, without actually... show more I understand basic geometrical shapes(squares, circles, lines, dots, etc.), but why was the five-pointed shape assigned to a star-when the stars in the sky look nothing like that? Same thing with the heart-shape. Why did people assign the upside triangle with two half circles on top to a heart, without actually looking at a human heart.
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