my daughters riding instructor did that but she pulled it off and the officer was so impressed he didn't ask her to walk a straight line. it's all about presentation.
Could also be a form of camouflage that utilizes the optical characteristics of insect eyes so they see something else, like a glint of light or a messy (uninteresting) background.
Pretty sure those rectangles were dog (Seluki, Afghan, Greyhound) racetracks. it's a traditional sport in those areas even today and the tracks look about the same except they now use cars to pull a carcass for the dogs to chase. some use live gazelles, which sort of goes with the Gazelle hunting weirs (KItes) found in in those same areas. the only bones found associated with the rectangles were goat, cow, and gazelle skulls. Maby some research into the social situations around dog racetracks today would put some light on why it was done. Religion probably had an influence somehow, for example golf was at one time a religious practice in Scotland, but nobody does it for those reasons today. 7000 years ago winning or loosing a race could have meant throwing big feasts instead of exchanging cash bets.
wasn't this story busted a couple of years ago? someone went there and it didn't exist. even so, many kudos to anyone who could care at all, many more to any who'd verify or debunk it :)