Every once in a while you see something and you have no idea what is going on. As a United 767 climbed out from O’Hare, it was streaming something from the fuselage. I saw it through the viewfinder at the time and figured it would be obvious what it was when I looked at the pictures. It turns out I still don’t know what was happening. Anyone reading this that has any ideas, please let me know what you think.