Harbor Slush
The harbor at Algoma, WI was busy making slush on the morning I snapped this image. There were chunks of ice undulating with minimal wave action. As they moved, ever so slightly, together and apart, the slush in the water created by the cold temperatures was pushed up between the chunks of ice, creating the ridges seen here.
This was taken right at sunrise on a Sunday morning. If you squint, you can see the first hint of the morning sun on the horizon, just to the right of the lighthouse.
If you have a large monitor, you may be able to see a larger version if you click on the photo.