5815556160749568Cast Helix 華 The grooves engraved in the two rotating boards are called "logarithmic spirals." These two grooves always cross at right angles, and a square hole is formed at Product #: felixpuzzle-Cast Helix 華https://www.felixpuzzle.store/i/UqTevIgAA2024-09-25 Regular price: $HKD$100.0 Available from: Felix Puzzle 智趣坊In stock
