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(Apology for posting a little OT):
About 40 years ago, I put the magnet of a magnetic-mount CB antenna against the face of the CRT of a monochrome TV set.
The effects were psychedelic. At several inches, a small portion of the picture was distorted and the image in the center was turned clockwise.
Placing the magnet closer to the tube turned it drastically, and created a "Black Hole" in the image.
After withdrawing the magnet, the picture assumed normal shape as if nothing unusual ever happened.
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