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The grain on this one is gorgeous, and the way the ternary mechanism clicks through each of its eighteen moves feels incredibly precise. I’ve had it out on my coffee table for a week and guests can’t stop picking it up, even the ones who hate math.

Eighteen moves sounds intimidating, but the mechanical "click" of each step is so satisfying that I found myself solving it twice in a row. The ternary mechanism is brilliantly engineered, and the wood finish is flawless. My math-obsessed friend was stumped for a full hour.

The wood grain feels almost silky against my fingertips, and the way each panel clicks into place is deeply satisfying. I've spent two evenings just working through the eighteen steps, and the moment it finally opened was pure triumph.