Perhaps it was caused by a close encounter of the 3-D kind.
This sophisticated crop circle uses an optical illusion to give the impression of a three dimensional cube.
The creators of the 200ft wide design in a field of wheat at Clay Hill near Warminster, Wiltshire remain a mystery.
The area is known as the UFO capital of Britain after repeated sightings of unearthly objects and numerous crop circle appearances over the last few decades. More + pictures...