Russ Swift does it without geometry and uses much less space. <a href="http://www.youtube.com/watch?v=REpXf0cmJ64" rel="nofollow">http://www.youtube.com/watch?v=REpXf0cmJ64</a>  (Sorry I couldnt find it in English.)<p>The new world record: <a href="http://www.youtube.com/watch?v=P7Eqn_BiQus" rel="nofollow">http://www.youtube.com/watch?v=P7Eqn_BiQus</a> (Watch it with the sound off to avoid the screaming commentator.)