Hollow Cube

My gallery is a bit neglected, mostly due to the fact that I use flickr for photos and dA to everything else, so here goes something new.

There is a puzzle with the same principle of Rubik's Cube, but instead of being solid looks .... well... hollow like the render shows, I don't know the link to the seller's store (a google search should solve it though)

Done in Art of Illusion,
Polygons: a few thousands
Textures: 3 (1 procedural)
Lights: 1 Point, 1 Spot
Render time: a lot.