The French film maker Neels Castillon has made a beautiful short film on the movements of thousands of starlings in the evening in the skies around Marseille.
The film is a series of images of a complex and dynamic three dimensional structure - the flock of individually moving starlings - projected onto a two dimensional plane - the CCD chip of the (mainly) stationary video camera.
Below is a set of stills from the video and below that the original film.
All images Copyright N. Castillion.
More background on the animal behaviour studies around this type of flocking (HERE).