Raspberry Pi and camera module alone is a great fun to play with. But when you start combining things, you start getting very interesting results. PiFace decided to experiment with bullet time effect by using 48 Raspberry Pi equipped with cameras and PiFace modules.
This effect got popular with famous Matrix effect where Neo avoids bullet by bending back. To get this effect working each camera has to be synchronized. This was done by connecting each board with network cable which yields to total ½ kilometer length. Comparing to professional setup this is relatively cheap solution to get things done. So it can be a great candidate for school class project or for low budget effect capture.