Somewhere in the ceiling hides a small power station. When I touch the ceiling, my hair stands on end. I touch metal then, I get an electric shock. Once you make the slightest movement, one has a colorful sea of lights from electric flashes. Power especially in the dark a lasting impression. My cat has the ceiling once nudged with his paw and flew across the room. The plan was the ceiling as protection for my bed when guests sit on there with their street clothes. That the bed is now protected by an electric barrier, hitting reckless guests with merciless electric shocks to flight, was not planned, but is also an acceptable solution.