Glass Sphere in double polarized light. A small three inch glass sphere sitting on a black tube stand in front of my computer monitor set to white, this is polarized and the source of light in the scene. The camera then has a CPL filter on the front of the lens. There is also a piece of clear plastic bag between the monitor and sphere causing the light to scatter in a prismatic color effect. You can see a small bubble inside the sphere of glass to the right.