This post is December 20th' part of the English F# Advent #fsAdvent series; make sure to also check out the Japanese series, which also packs the awesome! As I was going around Paris the other day, I ended up in the Concorde metro station. Instead of the standard issue white tiles, this station is decorated with the French constitution, rendered as a mosaic of letters. [Source: Wikipedia] My mind started wandering, and by some weird association, it reminded me of Calligrammes, a collection of poems [...]