Another common version first used to test photon mapping includes two spheres: one with a perfect mirror surface and one made of glass.

These use a chilled mirror and optoelectronic mechanism to detect condensation on the mirror surface.

With the formation of condensation on the mirror, the degree of cloudiness of the mirror surface increases with the direct transistor receiving less light and the indirect transistor more light.

The result was that imperfections of the mirror surface matched the patterns on the back, although they were too minute to be seen by the eye.

It has acres of silver and dark mirrored surfaces, contemporary colours, cool lights and cabins with balconies.