Interesting. In the wikipedia page it has a word I didn't know, synæstesis, and it has the interesting and rarely seen by me combined ae symbol. The internet told me this word is basically
https://en.wikipedia.org/wiki/Synesthesia. Having a sensation in one form gives rise to a sensation in another sense (seeing a number makes me think of a color associated with it). Exposure to art and ideas like this makes life so rich, love hacker news.