Boing Boing 

This trippy GIF reveals patterns each time you blink

trippy-blink Take a quick tour of how your brain processes patterns by blinking at different speeds while looking at this GIF. You'll probably see concentric circles appearing in different places, and possibly pentagonal lines now and then.

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Handy guide to image file types and when to use each

know-your-file-types-jpeg-gif-png

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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Einstein's tongue, the animated GIF

giphy-13 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 animated GIF

"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)