I've opened an Etsy shop, "Inspired by Math".
I'll be stocking it with posters of my trigonographs and such.
Trigonographer at trigonography.com,
spotlighting diagrammatic proofs for trig relations.
Hedronometer at hedronometry.com,
studying the dimensionally-enhanced trig of tetrahedra.
If I've helped you, I'm glad! If would like to buy me a
completely-unnecessary thank-you cup of coffee, see
my Ko-Fi page.