TITLE: Picture of spec?
QUESTION [14 upvotes]: I recall seeing a hand-drawn picture of spec of a ring (maybe of $\mathbb Z$?) that had been passed around in the early days of the Zariski topology.  Does anyone know where I can find a copy?

REPLY [6 votes]: Be sure not to miss this very interesting paper (in English) on "Mumford's treasure map" and related concepts: Lieven Le Bruyn: Un dessins d'enfants