Lakeside bumps on a log--mystery sculptures

The date on my photos says July 31, but I'm not really sure when I took these. That's probably close. From time to time someone creates an arrangement of stones on the lakefront. These were cute and must have required a lot of patience. The first is looking west over the dock with Mouse Island in view; the second to the east with Kelley's Island in the background; the third is a close-up.