This is a very simple modular origami design I recently came up with when revisiting my Oxi unit from a few years ago.
The unit has folded edges on one side and raw edges on the other, and this picture presents the better-looking side with folded edges.
Given the simplicity of this design, I would not be surprised if others had come up with it before independently [update thanks to David Mitchell:
Yes. It’s known, usually with folded edges on both sides though.].
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