Back in the 1980s Gary Overcare’s Unix Magic poster was a popular item at USENIX conferences. It depicts a Unix Wizard casting his spells in a giant shell surrounded by various Unix paraphernalia.
The meanings of the various parts of the poster have always been a bit mysterious but now David Rio has released an interactive annotated version of the poster. You can click on one of the items and get Rio’s explanation of what it is and what it means. These are Rio’s explanations not Overcare’s so we can’t consider them definitive but by and large they seem reasonable to me.
If you’re an old time unixhead and would like to have your own copy, they’re available.