Grand antiprism created by projection of 100 of 120 600 cell vertices and 500 edges {488 of 1/2 (3-Sqrt) and 12 of 2/(3+Sqrt)}. One face of this 3D projection contains the VanOss Petrie 30-gon projection. The removed vertices are from the inner rings of the 16-cell and their corresponding 4 Pi/5 rotations in the snub 24-cell.