Ah yes, I remember that. 1976 or 1977. My family had just moved from Munich, Germany to Montpellier, France, and my Mother, my brother, and I were cooling our heels in our usual summer vacation spot of Copenhagen, Denmark while my Father was setting up our new Montpellier digs. (That would be the same Montpellier that currently serves as home base for Lewis Trondheim and Jason.) WIth ample time on his hands, my Father, who was (and is) an avid photographer, had just discovered the age-old trick of photographing someone multiple times in front of a black backdrop to create the illusion of multiple iterations of the same person (no, kids, there was no Photoshop then), and had sent us some hilarious fumetti of himself in various goofy disguises interacting with himself.
Around the same time, future Marvel Editor-in-Chief Mark Gruenwald (whom I knew well through correspondence) — at the time still a fan, of course — had self-published his TREATISE ON REALITY, one of the central tenets of which was that the Marvel and DC universes contained an infinite amount of "realities" each of which was created by an individual human decision (a kind of sci-fi version of chaos theory in which the butterfly does AND doesn't flap its wings). So in one reality Peter Parker decided not to go to that science exhibit and didn't get bitten by that spider, or Bruce Wayne's parents didn't duck down that dark alleyway, etc. Those reality-creating "decision points" he dubbed "nexuses" (or "nexi"?). Somehow in my geeky mind this combined with the technique my father had been playing around with and the whole family got together (note my Mother's credit for "flying cucumber" effect) and created this illustration of what would happen if, as I was reading Mark's treatise, I found myself having to decide among continuing to read it, going for a snack, or going to bed (the trifecta of choices pretty much anyone faces when reading late at night).
Everyone got a kick out of it (including Dean Mullaney, who was very much the "nexus" of that group) and I've been lugging around that set of Xeroxes for three and a half decades — until some wisenheimer in the Fantagraphics offices found it in a box and slapped it up on Flog.
Tom Spurgeon's recollection on his comicsreporter.com blog that this ties into a group of round-robin fan correspondents that included Rob Rodi and Jo Duffy (also Ralph Macchio — the future Marvel editor, not the Karate Kid star) is on the nose.
I don't even want to think about how many of this blog's readers weren't even born when I did this.
Rest in peace Mark Gruenwald, a good guy who died far too young. Hopefully there are thousands of other alternate realities where he's still happily editing Marvel comics.