By setting the exposure rate of a camera to a very long period, you can capture movement of a single object over a period of time for some interesting photography ideas. And by use LEDs programmed to change after a certain period of time, you can use this display to make all sorts of effects, as demonstrated by Andrew Mulholland.
Andrew's system uses a python sketch on a host computer to process an image file and create an Arduino sketch that contains the image data. Once uploaded, the sketch controls an RGB LED strip which is moved across during the photography process. The single exposure can then capture a representation of the original image, for example: