Or is it “Coordinated Motion”? The latter makes more sense but the former seems to be the accepted term for describing burr-like puzzles whose assembly requires two or more pieces to be moved simultaneously and continuously. I guess I’ll just go with the flow and call them “coordinate motion puzzles.” One of the most beautifully made puzzles I’ve ever come across, coordinate motion or otherwise, is the machined aluminum / joined wood / metal 3D […]