I came across the attached on a somewhat faded paper.
This was drawn by Ted Kaehler of the Xerox PARC System Sciences Lab Smalltalk Group (home of Alan Kay).
At the time I was working on PARC’s portion of the DARPA Bay Area Packet Radio project, in which microwave-sized radio units could talk to each other at 100 Kbps or sometimes 400 Kbps across 10 miles or so. The tech report on that work may be found at https://www.rfc-editor.org/ien/ien78.pdf