People in a Connecticut town said someone cleared a series of intricate patterns in the snow at a downtown park.
The passersby Tuesday said they do not know who was behind the public artwork.
"I think it's somebody who has a lot of time on their hands, so they decided to have some fun in the snow," said Gloria Caprio of West Haven.
Colin Andrews, an expert in crop circles, said the snow circles show a lack of precision.
"The lack of symmetry, which I have seen around the world with regard to crop circles isn't here. The spiral symmetry from an elevated position lacks preciseness," Andrews said.