2120781 Spinning Points
Different patterns appear depending on the spinning speed of the black and white 3 swivel wheels

2120806 Turning Windmill
A gear system that drives all the windmills when turning only one.

2120814 Overplaying Colors
Colors turn in a real rainbow! The translucent colored acrylic sheets embedded in the upper wheel overlap with the colors of the panel to create multiple visual effects. 60 possible colors. Great introduction to mixing colors.