Hydrangea Cube instructions
Hydrangea, designed by Shuzo Fujimoto, is a popular origami tessellation whose molecule can be tiled or folded as a standalone model. After slight modification, it can also be used as a modular origami unit for folding cubes, icosahedra and other models.
The idea of making a modular out of modified Hydrangeas came from Meenakshi Mukerji in 2008. Simplified instructions were published in her Exquisite Modular Origami II in 2015. I came upon the same idea independently in 2015, and on flickr I was later able to find pictures of the same design from 2011, made by Anna Alekseeva and (with minor differences) by origami00023, who seem to have also come up with this idea independently.
The unit has two flaps and two pockets in the same arrangement as in Sonobe unit. It is equivalent to Sonobe in that anything that can be made with Sonobe units can also be made with Modular Hydrangea Units, e.g. the icosahedron shown to the right. The connection between units is quite strong and finished models are rather sturdy.
Do notice that folding a Hydrangea, even with just a few levels, is much more time-consuming than folding even the most complex Sonobe variant. You need just six Hydrangeas for the cube but thirty for the icosahedron.
This tutorial assumes that you know how to fold a single Hydrangea. You can find a diagram at
www.nickrobinson.info/clients/smithy/hydrangea_john_smith... and a video tutorial at
Shuzo Fujimoto’s own instructions can be found in his Folding Origami Hydrangea (おりがみ あじさい折り).