This video is a development/pre-visualization of  the pneumatic driver for my kinetic sculpture. The green cylinder is a air valve that will start/stop air flow when commanded from an Arduino. The white cylinder is a pneumatic cylinder with a hollow steel tube and a return spring attached to the plunger. When air is applied the tube is driven forward, and  the air flowing from it forces the LED out the end of the device as shown. I used this visualization to simplify my final design.