Jeff’s photos (left and center) of the ice circles with his smartphone turned out a lot better than those from my smartphone. However, he really does have zombie eyes from spending too much time in front of a computer. In addition to being a computer science professor, he owns a language software/app company in Dinkytown called Ultralingua; they also have word game app called Accio. Now if we could only convince him and his Twin Cities-based employees to relocated to Northfield. Hmmm.
Update 12/25: Patrick Enders emailed me this photo of a single large ice circle at the foot of the dam that he took with his iPhone about 1-2 weeks ago. He says in a comment below that there were two of them.
Update 01/12: Another batch of ice circles has formed during the current cold snap: