This video is a re-upload from 2017
some of the info in the video won’t be up to date and the quality isn’t the best. But hey! It’s back!
Although not “perfectly” void. From the right angle this puzzles illusion sells and thats about the best I can do without printing my own core. If you want to try one of these for yourself, I’d recommend starting with a Truncated Ivy Cube before trying to go straight for the tetrahedron shape.
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