Curves etched into a prepared field by a tractor and a multi-seed drill. This field, near Malvern in Worcestershire has been prepared for spring wheat. (I hope the weather held)
Single seed drills were used by Sumerians in 1500 BC, multi-tubed oxen powered drills were used in China in the 2nd Century. The idea was refined by Jethro Tull during the Agricultural Revolution on Britain in 1701. Eventually the mechanism was further refined and seed drills became popular in the 19th Century.
These Super curves clicked by me while out on my bike.!