cliparts/2/7/7/9/clipart-40-construction-geodesic-spheres-recursive-from-tetrahedron-2779.svg 040 Konstruktion geodätische Sphären rekursiv aus Tetraeder image/svg+xml Open Clip Art Library 40 construction geodesic spheres recursive from tetrahedron 2011-12-23T09:33:40 http://openclipart.org/detail/166464/40-construction-geodesic-spheres-recursive-from-tetrhahedron-by-ric5sch ric5sch circumscribed sphere clip art clipart constrution geodesic sphere geometry parallel projection