Platonic solids-Inscription in the sphere by Euclid's construction Plato describes the regular polyhedra in the "Timaeus" giving them symbolic meaning:-tetrahedron-fire, cube-ground, octahedron-air, icosahedron-water, and the dodecahedron-universe, in an attempt to prove that the basic cell of the universe are equilateral triangle and regular tetrahedron. He didn't succeeded completely, but his follower Euclid did. By the geometrical construction of dodecahedron over the cube, then by inscription of all five regular polyhedra in the same sphere, he sustained Plato's idea. Author of the drawings: Laurentia Stolić Author of the photo: Radmila Stolić