Where'd this come from? This sure wasn't on my bookshelf yesterday.

Illustrator, 2h.

Shirts/stickers/notebooks:
https://www.redbubble.com/shop/ap/114408606?ref=studio-promote
High-res and Illustrator source:
https://www.patreon.com/posts/68064926
Outline view and a few process notes: https://egypt.urnash.com/blog/2022/06/21/sacred-geometry-for-higher-engineering/