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It's a Droste brick!

From Wikipedia: The Droste effect is a Dutch term for a specific kind of recursive picture, one that in heraldry is termed mise en abyme. An image exhibiting the Droste effect depicts a smaller version of itself in a place where a similar picture would realistically be expected to appear. This smaller version then depicts an even smaller version of itself in the same place, and so on. Only in theory could this go on forever; practically, it continues only as long as the resolution of the picture allows, which is relatively short, since each iteration exponentially reduces the picture's size. It is a visual example of a strange loop, a self-referential system.

Notebook Droste!

Brilliant.

It's called the droste effect.
http://en.wikipedia.org/wiki/Droste_effect
Example here:
http://www.post-literate.com/gerpunx/archives/2005/01/prepare_to_lose_your_mind.php
(not safe for brains)