Follow @blue on mathstodon.xyz, the mathy Mastodon instance.

See my (Tee)Spring shop, "Inspired by Math", for t-shirts featuring some of my mathy
designs that have become somewhat popular on Math.SE.

My Etsy shop, also "Inspired by Math", has posters. (Want a particular design? Tell me!)

Contact me via the "Email the Trigonographer" link at trigonography.com.

Trigonographer at trigonography.com, spotlighting diagrammatic proofs for trig relations.

Hedronometer at hedronometry.com, studying the dimensionally-enhanced trig of tetrahedra.