Flying over Lake Michigan into Chicago in the winter it looked like someone had dropped a ream of copy paper in the lake, and the water was flat - just hundreds of equal sized white rectangles on a waveless surface. When we reached the shoreline and I saw that each "piece of paper" was larger than two houses put together I realized the lake looked smooth because the waves had been too small to see. I still don't know what the "paper" was. Ice? Why would it have all been so regular in shape and size?