The formation, measuring 150ft in diameter, is apparently a coded image representing the first 10 digits, 3.141592654, of pi.
It is has appeared in a field near Barbury Castle, an iron-age hill fort above Wroughton, Wilts, and has been described by astrophysicists as “mind-boggling”.
Michael Reed, an astrophysicist, said: “The tenth digit has even been correctly rounded up. The little dot near the centre is the decimal point.
See also: Crop Circles in South Korea 2008
(via Cabinet of Wonders)