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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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XKCD reveals your visual perception quirks

Today's XKCD, "Visual Field," is a terrific mind-bender: a series of optical experiments to try with your computer's screen and a rolled-up piece of paper that demonstrate the quirks of your visual field: your blind-spots, your ability to perceive detail, night vision, the ability to perceive polarization, sprites and floaters, color perception and so on.

Visual Field