A paper ball seems like it would be the simplest of paper toys, but besides being a classic origami subject it also involves some of the most advanced modular origami designs.
Paper Ball Models
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How To Make An Easy Origami Ball (Paper Balloon or Water Bomb)
I remember playing with this inflated origami ball and a pair of pencil boxes as racquets when I was a child. There was something magical about making your own ball, however flimsy. This inflatable model goes by many…