JF Ptak Science Books  Quick Post 

Just yesterday I posted on Found-Abstract art  (https://historyofideasblog.com/thesciencebookstore/2018/10/found-art-in-electrical-hardware-1885.html) in a cross section of a conduit of telephone wires from 1885. Just now in research a bit on Tesla I found the following diagram for a classroom demonstration in acoustics (appearing in Nature, 11 February 1892) which could easily be added to a list of unintentional/unrecognized pre-Abstract Art art. If you varied the disks in black and white and motorized the whole thing you could imagine it another decade in the future as a work by Duchamp. As it is, it is an ingenious piece of thinking (the whole article follows):

And one still of many from Mr. Duchamp’s “Anemic Cinema”, 1926: 

For a video of the film: https://youtu.be/dXINTf8kXCc

Also a nice piece on Duchamps optical experiments from Hyperallergic: https://hyperallergic.com/323582/duchamps-spinning-optical-experiments/