blinryI made a pop-up card that spins as you open it!
It uses a geometric mechanism invented by an unknown student at Musashino Art University in 1988! Instructions here: http://www1.ttcn.ne.jp/a-nishi/popup_spinner/z_popup_spinner.html
Another surprising result from computational origami: If you fold a piece of paper correctly, you can cut out arbitrary shapes with a single, straight cut! Even multiple ones! This is possible for all shapes!! :O
Christian Haselbach@blinry all shapes as long as they are polygons?
@haselbach Right!