Get in touch with the geometric blueprint of the cosmos. Use this solid crystal set of the 7 platonic solid shapes (traditionally there are just 5)  to connect with universal pythagorean frequencies. 
 
What are Platonic solids? 
"The Platonic solids are prominent in the philosophy of Plato, their namesake. Plato wrote about them in the dialogue Timaeus c.360 B.C. in which he associated each of the four classical elements (earth, air, water, and fire) with a regular solid. Earth was associated with the cube, air with the octahedron, water with the icosahedron, and fire with the tetrahedron. There was intuitive justification for these associations: the heat of fire feels sharp and stabbing (like little tetrahedra). Air is made of the octahedron; its minuscule components are so smooth that one can barely feel it. Water, the icosahedron, flows out of one's hand when picked up, as if it is made of tiny little balls. By contrast, a highly nonspherical solid, the hexahedron (cube) represents "earth"." - Wikipedia
 
Use this set for your altar to work with each separate geometric pattern seperately or use all of them to harness higher energies in your meditative practice.