Unpolarized PC Monitor
A PC LCD monitor has had its outer polarizer removed. Regardless of the image displayed to the monitor, the audience sees only a white screen. Placing a polarizing disc in front of the monitor reveals the colors being displayed. Rotating the disc about 45 degrees clockwise from horizontal alignment reveals the correct colors of the image. Rotating the disc 90 degrees in either direction will show the inverse of each color displayed.
|Laptop available if needed