Challenging Rubik's cube
A Finnish physicist-turned-artisan by the name of Sauli Jämsä has challenged the famous Rubik's cube by developing a three-dimension wooden puzzle, which he calls 3Doo Puzzle.
The bigger version contains 27 detachable parts and the smaller, which is suitable for pre-school children, four. There is only one correct solution to the puzzle, which develops and entertains both children and adults, in addition to which it is an attractive-looking object. The main material is birch.
The 3Doo Puzzle has been awarded a Finnish prize for its aesthetic appearance in addition to receiving a national innovation award. It was presented at an inventors' fair in Brussels in November 1999.