This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
A polyhedra ortho. en October Tetrahedron family polyhedra projections of vertices for example use not for articles November UTC Tom Ruen talk created this work entirely by myself br from org en Tom Ruen talk en Tomruen Original upload log page en Apolyhedraortho Tomruen bytes no Tetrahedron family polyhedra projections