Zometool Kepler's Kosmos Build a beautiful model inspired by the work of Johannes Kepler; the 17th century genius who laid the foundation for modern astronomy Kepler believed the orbits of the planets were determined by a nested arrangement (like Russian dolls) of the 5 perfect 3D shapes; the Platonic solids This particular arrangement of the nested Platonic Solids was proposed by renowned mathematician John Horton Conway Contains 158 precision-made components; a colorful instruction booklet; lifetime manufacturers warranty Zometool is the construction set that kids and Nobel Prize winners get hooked on