Yes, and with the actual link being:Broken link!
Try this one. It might be the same as Bart's link, or very close.
Yes, and with the actual link being:
http://www.absolutewrite.com/forums/Escher's Lego Relativity.
pointing to "something" on AW forums when the OP most likele meeant something else, it's VERY frustrating!
Okay, hold on, I bet I can find it with this Google thing...
Yes, I did!
http://www.andrewlipson.com/escher/relativity.html
And this appears really popular (21,000 hits), with a bunch of digg-type sites linking to it in the first page of links.