Well, it's what they are... sort of? Whirlwind-hime and her granddaughter-by-adoption, Multics-chan, circa late 1960s I suppose?
Btw, "prodigal" may be the best adjective I've heard to describe Multics. The OS or the -tan)
Another really old drawing that I felt compelled to upload. Lest it be lost to history, or in a pile of sketchbooks.
Pencils, black sketch book.