Chicago Sunset Cloud Waves Countdown Timer

I have never seen a sky write like that. The clouds had been combed into long ripples, row after row, all of them catching the last of the orange, so that the whole upper half of the frame looked less like weather and more like somebody had dragged a fork through wet sand. Underneath it Chicago was already going dark, the towers turning to black paper cut-outs with a few lit windows still showing. That is the Willis Tower on the right, the one that used to be called Sears, with the round-topped building on the left, and in between a strip of expressway with the headlights starting to come on in a slow orange line. I was up on a rooftop on the near north side, on a tripod, freezing, because the wind off the lake in that season does not negotiate. A guy came up to the roof to smoke and stood next to me for a minute without saying anything, and then said, that is some sky, and I said yeah, and that was the whole conversation. Then the orange went out and it was just cold and dark and time to go down.