Sir Roger Penrose being my current man crush, I have stumbled on this video of his father's Lionel's work. It is the most extraordinary thing to see out of the blue. I couldn't believe my eyes. The implicit seeding principle is making steam come out of my ears.
(I think I was nattering on to PG over the weekend about Sir Roger's father and uncle both being in the Cambridge Apostles. Stumbled upon Dad looking for surrealist uncle Roland with whom Peter was familiar.)