3-hoek
Triangle
Wiskunst
Abstract, wiskundig model
6-hoek
Hexagon
Kubus
Cube
Kubus
Cube
Kubus
Cube
Verdeling in repen (5, 19, 7, 3)
Partitions (5, 19, 7, 3)
Papierknoop
Paper knot
Double twister
Double twister
3/8-vogelbasis
3/8-birdbase
Oripuzzel onoplosbaar
Oripuzzle unsolvable