Dice set with percentile modeled in a Steampunk theme. The dice range from 16mm to 24mm.

If M.C. Escher had owned fidget toys, he would have worn "One ring to rule the ball" as a pendant. A single, continuous line contains a small ball that makes orbit after mesmerizing orbit but cannot escape, always held down in four directions. Available in solid, durable stainless steel with optional antique bronze and gold plated finishes to fit any context, "One ring to rule the ball" now also includes a free rubber necklace so that you can confuse your mind any time the fancy strikes you! One customer echoes many others in saying, "I couldn't put it down. This thing is just too fun!"

Purchases by those gracious customers have now paid for the design time on this piece so it is available on a pay-what-you-want basis. Ordering from this page contributes 5$ towards continuing work such as the new, even more impossible "One ring to pwn the ball" (just released October 18th!) which can be found at http://www.shapeways.com/model/145172/one_ring_to_pwn_the_ball.html and the open-source "Ultimate Desk Toy" at http://www.shapeways.com/model/109166/ultimate_desk_toy.html . To download the original 3d file for your own use under a CC-BY license ( http://creativecommons.org/licenses/by/2.5/ca ) click "Download" at top right . To learn more about this design or other work from Terra Cotta, visit our website at http://www.terracottapf.com

This is a 16mm to 24mm dice set modeled after the Deathly Hallows from Harry Potter.

The Black Strong & Flexible set (red background) was hand-painted using Spanish Copper and Gold rub'n'buff (sold separately).

Alumide set was dyed black and painted with silver enamel (sold separately).

This is a fun gadget that you can have you in house to show your friends how the sphere was printed inside the rail and you can never detach it! http://www.shapeways.com/model/edit/605978/ [NEW] Buy the v2.0!: http://www.shapeways.com/model/108596/rail-with-a-ball-inside-keychain.html Buy the Keychain version

The BBC feature The Code, which aired in the summer and fall of 2011, culminated in a treasure hunt. This is the treasure. The original was made in bronze-finish steel and silver; this recoloured model shows the structure. It is a rendering of the five Platonic solids, nested.
An uncoloured version is here.

This is a fun gadget that you can have you in house to show your friends how the sphere was printed inside the rail and you can never detach it!

There are six regular convex polytopes in 4D, which are analogous to the five Platonic solids in 3D. This is the sixth, the hypericosahedron, with 600 tetrahedral cells.

This was the hardest of this group to make a printable model of. For a Schlegel diagram one would need quite a large size to allow the amount of interior complexity required, and it gets difficult to build as well as expensive, so I used this face-first projection suggested by Henry Cohn. Some of the tetrahedral are collapsed and become planar, but on the plus side the complexity is on the outside where you can see it!

This prickly sphere looks amazing in 3D, you can lose your self for hours playing and being mesmerized by it.
It doubles as an acupuncture ball, roll it around on your body ( I love it on my head) to relax and circulate your blood, the skin feels tingly afterwards. 

This part consists of all five Platonic Solids nested one inside another.

From largest to smallest, there is an icosahedron (20 triangular faces), a dodecahedron (12 pentagonal faces), a hexahedron (6 square faces), a tetrahedron (4 triangular faces) and an octahedron (8 triangular faces).

The overall shape is a Rhombic Triacontrahedron, a combination of an icosahedron and dodecahedron).
These can be nested infinitely following the same order.