Butterfly
Totem intro-estro
Twist
Line
Impossible cube
Totem 02
Totem 01
Tree cube
Concave convex
Ambiguity cube
Destructuring of a known process
Propeller
Folded sheet
Four quarters
Decomposition of a square
Crossing of two square
Quaterfoil
Wave
Door
Double cube
Door lock
Circle arcs