Just waiting for the first fool to connect live mains onto a wall... or one of those high-voltage electric cow fence supplies.
Or, more of an art form: connect a 10 kV source to a conductive wall , where the two painted lines diverge from each other. In theory, the arc should move upwards, just like in school.
Or, more of an art form: connect a 10 kV source to a conductive wall , where the two painted lines diverge from each other. In theory, the arc should move upwards, just like in school.