That's actually not how it was constructed, as it it loops.
Like I say, I was / am part of the art group who did this.
http://www.ice.org/index.php?display...&packID=200409 was the original post.
Tiles were drawn as follows
Large rectangle, with the middle missing
and smaller rectangle, that fitted into the middle
So you'd be zooming towards the smaller tile, when it hit the size boundry, it'd swap w/ the larger, and the next smaller tile would fit in.
It was a collaboration of multiple artists making their tiles seamless.
Other similar, but flat tiles can be found at
http://tiles.ice.org