I dunno, i think the art of thumbnailing is something that needs to be studied on academic level. There is something that makes it stand appart from other forms of communication that gives me a vibe
By now, Veritasium has the thumbnail production and title selection down to a science. A wacky, "guess how algorithm feels today" kind of science, but a science nonetheless.
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They did a whole video about it: https://www.youtube.com/watch?v=S2xHZPH5Sng