Mathematical Sculptures

A bottle of Klein ( Wikipedia article ) and, concurrently, a beer bottle opener.

Or this thing:

Like? Buy here: www.bathsheba.com/math . There are many interesting things. Only expensive. Hundreds of dollars.

You can also read how such things are done: bathsheba.com/sculpt/process

And you can also try to win such a statuette on quotes for Al Zimmermann's Programming Contests programmers. Today a competition called “Son Of Darts” started there. There are no restrictions on the programming language for solving the problem. Actually, you only need to send an answer that you can even guess.
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Only the contest lasts a year.