<b_jonas> slashlearn euclid//Euclid is a short geeky game in which the goal is to do Euclidean compass and straightedge constructions in as few steps as possible. It runs in the browser, found at "http://www.euclidthegame.com/". It was popular among #esoteric regulars in 2016-07.

Blæg is a color that cannot exist under the current understanding of physics. It is used on the #esoteric flag, along with ultraviolet and whatever is convenient. It is a nullary color, meaning that it can be mixed with itself to produce the primary colors.