Interactive shadow concept

Based on the idea that a shadow does not differentiate between races, my concept is to have a system of cameras and lights installed that would create an individuals shadow in changing colours on the floor or wall of the station platform. The length and colour of the shadow would change depending on the time of day so that you would have a different experience and make your wait for a train more pleasurable.

Unfortunately, working out a system that would work and creating decent visuals has proved almost impossible for my tiny mind, so it's going into the draw marked "Ideas to be Revisited at a Later Date".