I made a little video and wrote a little poem to go with it. It's titled "The Mosh Pit of the Sun and Moon".
I was strolling along the river near dusk and looked up into the sky and there was a flock of small birds converging and merging. At times smaller flocks would appear and crash into the larger flock joining them, becoming a part of the controlled chaos of the larger flock.
It went on for quite a while. Take a look.