Have you ever seen a paper balloon? The Japanese toy called kamifusen has been around for over 100 years. Japanese mathematician Tadashi Tokieda blows one up, but that’s not the only way you can make your kamifusen round. The other way is srprising.
Rocket scientist Ichiro Fukumori wrote about the properties of kamifusen.
Part of the kamifusen’s genius is the paper from which it is made.
The paper…
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