3D Printed Puzzle originally invented by Bram Cohen who has a name very similar to Bram Cohen who wrote bittorent.
I quite like this because it looks as though you can eat it.
When I was 6 my dad taught my school and he got the kids to make abacuses using life-savers which are sweets in the shape of life-savers. All went well for a while… a week or so. Then the kids ate the abacuses.
These were the kids.