The image above certainly looks like a black and white spiral, but it's actually a set of concentric circles.
The optical illusion, titled "blue-green algae spiral" by famed Japanese optical illusion creator and experimental psychologist Akiyoshi Kitaoka, has been making rounds on the Internet for a while (Kitaoka made it back in 2007) but try as you might, you just can't convince your brain that it's NOT a spiral.
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So let us clearly show that the spiral optical illusion is, in fact, a series of concentric circles:
And now, for something extra trippy for you: