I must make some isocahedron gem!

This is a screenshot from @makeshifted, back in December 2022, that showed up in the last snapshot the Internet Archive could take of my twitter timeline. A repost with the annotation "3D was *that* awesome back in the Assembly 9x #demoscene days."

It showed up again a few times ago and I told to myself "you know, those stonekeys in Commander Keen ? Well, if I can make NDS 3D look that sleek, I won't need to pixelstudy them!

And it appeared again, posted by @benji__t this week-end while I'm doing my farewell tour on twitter.  

One possible system of Cartesian coordinate for the vertices of a regular icosahedron, giving the edge length 2, is: $${\displaystyle \left(0,\pm 1,\pm \phi \right),\left(\pm 1,\pm \phi ,0\right),\left(\pm \phi ,0,\pm 1\right),}$$ where ${\displaystyle \phi =(1+\sqrt{5})/2}$ denotes the golden ratio. -- https://en.wikipedia.org/wiki/Regular_icosahedron --

Oh! look at that ...  

Take a tetrahedron of psi, split summit so that it turns into a 2-edge, and voilà! isocahedron !

- - - 

those words above were written around the 19th of February, last year. I haven't written a single line of DSGL to make it appear in the infinite pyramid, and while I initially thought of using it as keygems, I realise that what they really be are the "magic stones" that you collect after defeating bosses.