I was out on my deck, when my attention was drawn to the sky over the Mississippi River. I saw a black mass in the sky, approximately over the far shore. It appeared similar to an amoeba, without definitive shape, initially. It was pure black, non-reflective, and without lights. As I watched, it turned slightly, and I could then see that it had a diamond shape.
It was gliding through the air at a moderately slow yet steady pace, and in the same flight pattern that army helicopters commonly fly here.
With this comparison, I could see that it was about as big as two of the largest army helicopters, stacked on top of one another. It made no discernable noise. I watched it for about two minutes.
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