I look at the Mars images every day. There has been discussion of chunky areas that resemble pack ice on Earth. The latest photographs, look like a suddenly frozen ocean. I can't imagine what might have caused that to happen. But the sand dunes look much more like water waves than sand waves, at least in the locality where the Opportunity Rover is gathering images. Whatever these images may be, they are so elegant, and beautiful beyond belief. Aesthetically they are beyond compare.