Choice of color in a movie can say a lot about what's going on in a scene. It sets the mood, changes the tone, indicates a change in point of view, so on and so forth, which is why moviebarcode is so fun to click through. The concept is simple. Take every frame in a movie and compress it into a sliver, and put them next to each other. Voilá. Movie barcode.
The above is The Matrix, making it obvious when they're in and out of the system. Below are Kill Bill and The Social Network, respectively.
See dozens more on the moviebarcode tumblr, which is also selling these as prints.