Using https://what-colour-is-that.glitch.me/ to decode a paper which assumes much more colour vision than I have. Even though I made the app, I still don't believe those colours are different!
(the paper is Bill Gosper's "Rectangle Arithmetic", by the way - http://gosper.org/rectarith12.pdf)
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!