(YouTube link)
A camera was installed on the roof of the Exploratorium in San Francisco to record the sky every ten second, every day, for a year. At 24 frames per second, that's a six-minute time-lapse movie every day. Ken Murphy arranged 360 of those videos onto a grid in this video, so all those days play simultaneously. You should watch this in full-screen mode, then you can keep up with the time in the lower right corner. Apparently the bars just above the middle represent winter. Read more about the project at murphlab. Link -via The Daily What