This is wild. When cameras try to capture guitar strings being played, they see wavelength-type movements from each string because of the camera’s rolling shutter effect. But it can only be seen on ...

Magnets keep strings suspended without anchor points, and pushing a magnet piece bends notes, so you get expressive sounds with simple moves.

There are pages of explanations about what you're seeing here, but first just watch this. Obviously, it's a camera looking at the strings of a guitar from inside of the sound hole. The illusion is ...