Ordinary Video in 3D

Normally when you watch a video, you perceive the flatness of the screen because your brain compares the image it sees from each eye and realizes that the objects on the screen are not solid. But try this:

1. Position yourself so that the video screen fills most of your field of vision and watch a segment where the camera angle is moving around.
   
2. Close one eye.

The illusion is very convincing because you eliminate almost all the cues that your eye is looking at a flat surface. Note that following these procedures will also make you one-eye high.