Checkerboard Illusion Video

Here's an impressive video version of the "checkerboard illusion." The lighting conditions in the room are set up to trick us into thinking the low light is the main light in the scene, but actually the top light facing down is dominant.

The giveaway is the lack of a cast shadow of the whole checkboard table onto the floor from the purported key light. They should have painted that, too.

Thanks, Jocque