A little fun with Hands-On Demo development at the museum today - note the purple ring toward the bottom of the device. A very high RF voltage is ionizing the air between the emitting disk on the machine, and the ring a few inches away. When I heard the phrase "well, this is an experiment first conducted before grounding electricity was really known..." was when I backed out of the room. (Don't worry, they did rig grounding and observed good safety practices.)
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