https://www.youtube.com/watch?v=J5iPbihuzPc
Ok, so admittedly this is actually kind of neat…
“The water temperature on the Lake Michigan is just a little bit below freezing, so you get a small piece of ice that forms in the water and as waves move back and forth it adds additional water and freezes in layers. It gets bigger and bigger, and eventually you get big balls of ice, that are pushed to the shore by the wind.”
(video via Boing Boing, description via The Atlantic Cities)