| For most burr shapes, such as the 6-piece burr, if you have no internal
holes, then the first piece that moves will come out all the way. This is
because the burr shape is 'rectilinearly convex'. This is not true for the
standard 24-piece burr shape. I decided to design a 24-piece burr in which:
1) there are no internal holes
2) the pieces are all notchable
3) many moves are required to remove the first piece
Here is the result of several weeks of design effort, using computer programs
to assist in the process. It takes 7 moves to remove the first piece. |
