I had breakfast at Union Station yesterday morning, a three block walk from the hotel. It was very warm, but not as humid as it had been, so it was a reasonably pleasant walk. The sun was especially sharp, so on the way back I picked my route to take advantage of the shade provided by various tall buildings. This meant walking down F, then turning onto New Jersey Avenue, which runs north-south with tall hotels along the east side of the street to block the sun. Except that when I turned onto NJ, the trees along the street were all showing shadows, which they shouldn't have. Not only that, but the shadows were in the wrong direction, and the light surrounding them was bluish, rather than the warm yellow of sunshine. Took me a second to realize it was sun reflecting off the National Organization of Realtors headquarters across the street. Very cool effect.