Very similar effect can be found here:
<a href="http://www.andrewlipson.com/" rel="nofollow">http://www.andrewlipson.com/</a><p>Andrew is also the person who was behind some Lego(tm) reconstructions of Escher's work:<p><a href="http://www.andrewlipson.com/escher/balcony.html" rel="nofollow">http://www.andrewlipson.com/escher/balcony.html</a>