Plato, the Greek philosopher who lived in the 5th century B.C.E., believed that the universe was made of five types of matter: earth, air, fire, water, and cosmos. Each was described with a particular geometry, a platonic shape. For earth, that shape was the cube.

The ancient philosopher Plato conjectured that the universe was composed of particular geometric shapes;
the earth, of cubes. Findings from a multidisciplinary research…

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Source: archeo