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At last it is August, time to leave the tribulations, trials and triumphs of sustainability and think about something completely different for a change. Crop circles, perhaps? I first encountered crop circles one summer evening, driving across Salisbury Plain on the A303. As I approached Stonehenge (tut tut, millions spent, still nothing done), I noticed on the opposite side of the road a large number of parked cars and a sizeable gathering of people in a wheat field nearby.