Arunshory M posted a handy chart from Who is Hosting This describing image file types and the best ways to use each one.
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Based on UPI photographer Arthur Sasse's famous photo taken on March 14, 1951, Albert Einstein's 72nd birthday. GIF source: Psychedelicacies (via Imaginary Foundation)
"Penrose Stars", a GIF created by davidope and inspired by the famed impossible object, the Penrose stairs. See more of dvdp's abstract GIFs here. (via Imaginary Foundation)