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Customer action shot Recursion understands Haitham.

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Lather. Rinse. Repeat.

We think the Jargon File defines recursion best:

recursion: n.

      See recursion.

"In order to understand recursion, one must first understand recursion," printed in white on a 100% cotton, dark chocolate t-shirt.

Note: The earliest version of this shirt had a period at the end before we thought better of it. So if you get one with a period, cherish it. It's a limited edition.