That Other Calder

Here's that black Calder stabile I mentioned earlier. This one is located outside of the National Gallery of Art-East Building, and those blocks in the background were evidently designed by I. M. Pei (but more on that later). I was unable to find the name of this piece, but it's got to be Alexander Calder. And something I missed during my trip was one of his mobiles inside this very building. That's what I get for not doing my research beforehand.