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Ontario, Canada-based photographer Matt Molloy recently created a gorgeous series of sky images by stacking multiple photos onto one. Follow this LINK for more about the creation of this and other cool images that are created through timelapse photography. A very legitimate and cool form of photography, which has a similar method in motion pictures that was developed by Ray Harryhausen among many other film giants of the earth sixties and Willis O'Brien who used the method to create a very realistic and frightening King Kong during the thirties.
It's also a technique used to create motion trails like you'll see tons of in the upcoming TV series, "The Flash."