How To: Fold a hollow 3D Sonobe kusudama

This is origami, but it's more of a work of art. A perfect 3D mathematical kusudama, which is created by sewing multiple identical pyramidal units together to form a 3D Japanese paper model.

It's really addictive! This is an easy kusudama and you can make it in just one day. And for those of you who only believe in origami purism… no glue and super easy!