I 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

Home > Geometric toy > Popup Spinner

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
@blinry Enterprise-D or didn't happen!
@blinry Wenn das geht bin ich richtig baff, denn das wäre ja ein Shape mit konkaven Ecken.
@blinry "Arbitrary" subject to thickness of paper, right? Some mathematically just fine folds are impossible with real world materials
@blinry ok I don't believe that (yet) but I'm looking forward to get my mind blown at the GPN21 :D

@blinry

Nice!

Saving so I can give this a go later.

#PaperCut #PaperCraft

@blinry what kind of paper is needed for this? I wonder if we could print the template/instructions on some sheets of paper and build them at the CCCamp23 in the Kidspace 🤔
@blinry What a great link! Thanks! So much fun stuff.
@blinry love it! I am a sucker for this sort of art!
@blinry Interesting. I often see (essentially) this design attributed to Raman Razani, with a pattern in one of his books from the 1990s.
@blinry Cool. Ich bin auch ein Popup-Spinner 🤣 .

@blinry

My wife is a cardmaker and she thinks this is awesome.