Summary

Combining the 5 platonic solids into a single piece of art Kepler used the cosmographicum as a symbol of the harmony of the spheres. https://thatsmaths.com/2016/10/13/keplers-magnificent-mysterium-cosmographicum/

This art piece shows that inside one set of platonic solids is yet another set of platonic solids. Its idealizations all the way down. The physical reproduction is limited by resolution.