Not to mention what their motive might be. I'm not saying I'm a convinced believer in an extraordinary origin, but if the earthly constructors are after publicity, why haven't they ever stepped forward and claimed credit (except for a few exceptions which don't account for more than a fraction)? And why have they persisted for 20 years? There's no money in it. Steve Gray -----Original Message----- From: math-fun-bounces@mailman.xmission.com [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Simon Plouffe Sent: Sunday, June 22, 2008 5:15 PM To: math-fun Subject: [math-fun] method of construction : crop circles Yes they are made by humans, ok let's admit that, but I wonder : what is the method of construction they use ? some drawings are quite complex and they have 100 meters in diameter : How can you use simple tools to do that ? This is the puzzle for me. Simon Plouffe _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun