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Five intersecting tetrahedra. Of the models I found when diving into modular origami, this is the one which impressed and intimidated me the most. I waited until I'd built a few things before I tried it, and I was probably right to be cautious. The individual components are very basic, and not unlike modules I made earlier, but assembly was just a bit difficult to wrap my head around; I had to watch the assembly video almost frame-by-frame to figure out the intersections. (I read an explanation of what's going on topologically, but knowing this did not result in correct assembly.) Anyway, I hope you're as impressed as I was with the design. I built a second one of these with green foil substituted for the dark blue, and gave it as a Christmas gift. n.n
