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It's a tattoo of the call-by-name Y combinator.

You'll get a stack overflow in a strict language, but not a lazy one.

$215? When I clicked through to the book, I see "Available from these sellers. 9 used from $597.95"

WTF?!??

Click on the hardcover edition link.

Aaah, I see.

Still, I give a big "WTF?!??" to the idea of paying $597 for any version of this book. I mean, I'm sure it's a good book, but $597 worth????

Heck, even $215 seems a bit crazy.

Though incomparable to the book, you may be interested in a free introduction by the author: ftp://ftp.cs.ru.nl/pub/CompMath.Found/lambda.pdf