The demonstrates the configuration space of folding a piece of sheet metal about its horizontal and vertical axis. The sheet metal can only be folded along the vertical axis if it has not been folded along the horizontal axis, or it has been folded all the way. The same is true for folding along the horizontal axis.

The current point in the configuration space is indicated with the red dot at the upper right.

(Click on image to interact with the application. WebGL must be enabled.)