Grand 600-cell, small spheres

This is a larger wireframe model of an orthographic projection from 4D into 3D of a regular star 4-polytope, called the Grand 600-cell (see Wikipedia). It has (in 4D) 120 vertices, 600 tetrahedon cells (self-intersecting), 1200 faces, and 720 edges. In this orthogonal projection, there are 75 vertices from the 4D model (not counting edge intersections) and 390 edges; these vertices are indicated with small spheres,which are not visible at some of the inner vertices.