Typographer Just van Rossum used his brother Guido’s programming language Python to create a capital letter H in which each serif (the dangly bits at the ends of the stems) sprouts its own serifs, creating a recursive H in the process.
Typotheque in The Hague made a limited edition poster of this design:
Slab serif typefaces are characterised by angular terminations at the end of strokes. Just van Rossum designed this ultimate Slab Serif capital H, with an ever-expanding number of serifs. Each H has four serifs, each of which becomes an H by sprouting additional serifs.The serifs on those serifs sprout their own serifs, on and on and on up to the thinnest line that offset press technology can handle.
See also: Geeked out coin wins design comp for another example of Python-based algorithmic art.