I’m very much digging these classic visual effects created by animation pioneer John Whitney using parts from an anti-aircraft gunsight. YouTuber crystalsculpture2 gives more info -

John Whitney’s demo reel of work created with his analog computer/film camera magic machine he built from a WWII anti-aircraft gun sight. Also Whitney and the techniques he developed with this machine were what inspired Douglas Trumbull (special fx wizard) to use the slit scan technique on 2001: A Space Odyssey

[Thanks Erica!]