This year is the first I noticed this particular kind of ice formation on the canal. There were quite a few of them. This one's about 8 feet in diameter. Each one has a leaf or small piece of surface debris in the center, resulting in that star-like center and the most interesting convoluted circle on the outside. It's a good example of how a large effect can result from a small initiating source. Chaos theory (click) here - (for the brave only).