"Tom emailed me this design a while back and kind of downplayed it. I thought it was a brilliant idea. As usual, I was right :-) This 5x5 cube is a shell with a hollow interior. Inside the cube is another 2x2 cube, minus one unit. The internal cube interacts with the shell in a maddening way, interfering with what should be a straightforward disassembly. There's even dead ends and false solutions. The large hole in the shell is there so you can poke your finger in and manipulate the inner piece. VERY fun design, and pretty tricky as well.
Precision made from various exotic hardwoods, I'm very pleased with how this puzzle turned out. Attention to detail is everywhere, from the 15,000+ bevels it took to make the run, to the jig gluing on a flatplate, to the overnight clamping of endgrain joints." -Eric Fuller