Another projection of the 4-dimensional hypercube, this one close to vertex-centered. I love the shape of its hull: almost a rhombic dodecahedron, but skewed just enough to keep the central vertices from meeting.
The more usual projection is here, other polytopes are here.

There are six regular convex polytopes in 4D, which are analogous to the five Platonic solids in 3D. This is the fifth, the hyperdodecahedron, a remarkably beautiful object brought to my attention by George Hart.

Here it's shown in a Schlegel diagram so you can see all 120 dodecahedral cells, though most are transformed by perspective: in this projection, the only regular dodecahedra are the biggest one on the outside and the tiniest one at the center.

A bigger model is here.

A 3-dimensional version of the Hilbert space filling curve. As shown in the photos, if printed in one of the "Strong & Flexible" plastics, it can be used as a bracelet or hair accessory. It takes a little time to reform back as a cube after being stretched, but it seems that leaving it overnight does the job.

You may have seen this model before, it's a free download at bathsheba.com.

Here it is straight from the artist.

John Sorrow, aka Desperateman, aka Dman...
check this : www.myspace.com/desperateman
and keep in touch thru : http://facebook.com/desperatem4n

This is an extension for the mini ES 2x2x2 puzzle

YOU NEED 8 PCS OF THIS to complete the "6 corners of the world" puzzle.
It was first showed at the following Twisty Puzzles Forum topic:
http://twistypuzzles.com/forum/viewtopic.php?f=15&t=19866

For the stickers, you need to contact me at: rubikkocka@gmail.com