Foucault pendulum

Have you ever seen Foucault pendulum work? Have you stand there and watch it for the while? It is for me a fascinating spectacle. On recent exhibit in Museum of Science and Industry in Chicago, they also added some color and mood to the show, so I was standing there trying to capture it photographically. I tried panning and tried blurring the ball, but I knew the image will be mostly about the blue colors of the scene.