Now it’s getting interesting. Yes, that’s a trapezohedron – in French, intriguingly called “antidiamant”. To be true to my source of inspiration, it properly ought to consist of bizarre non-Euclidean angles. Geometry – the only field of mathematics that I was ever any good at. (Note the past tense – nowadays I just hate using any kind of ruler.)

In the end it doesn’t matter – this crystal is an illustration of an abstract concept, not a scientific/magical device as such.

The Nyarlathotep storyline archives are here.