The right angle monument at Coral Castle has nothing to do with the actual technique but signifies a specific purpose within how the technique is performed, at G and C propogate as 90 degrees perfectly to each other.
Marko Rodin's website with a summary of his work and in depth articles
http://www.markorodin.com
275 Minute Presentation of his work - Recommend over the articles
http://video.google.com/videoplay?do...72442098545165
A video on Coral Castle and mathematical breakthroughs with it
http://video.google.com/videoplay?do...f+the+universe