Not sure if anyone's ever seen this before? I know I've seen it a few times in Boston - looks crazy, a little confusing too.
They have a huge tournament that pulls teams from Boston to San Fran to Canada; This years is hosted in DC - I suggest checking it out, worth the drive. I saw some of it when it was in Boston in '04.
This years site;
http://www.dcnacivt.com/index.htm
Old information on tournaments;
http://www.nacivt.com/index.html
Here's a link to some pictures (on the bottom are actual pictures of playing).
http://realkool.com/nacivt/photo.html
It's funny to see a quad-block - and the courts they play on. I think I'd forget it's asfault and dive...