Knotologie-Sphere 94
Knotology
Wiskunst
Abstract, wiskundig model
Onmogelijke driehoek
Impossible triangle
Tangram 7-delig
7-piece tangram
Tangram 6-delig
6-piece tangram
Draai-door
Infinite Flipper
Tangram 5-delig
5-piece tangram
Hart-tangram
heart Tangram
Puzzelstukken
Puzzle pieces A-F
Draai-element
First slit silver hexagon
Envelop
Polypost regular octagon