Plasma Spheres, Jacobs Ladders, Etc. Many of you have seen these things, which are glass spheres with an electrode inside.
Sparks fly from the electrode towards the surface.
If you touch the sphere or even move your hand close to it, the sparks will concentrate towards your hand. Jacobs Ladders You have almost certainly seen these. This has two wires with an arc in between, climbing upward. When the arc reaches the top, it goes out and a new one starts at the bottom. To find out more, see Sam Goldwasser's Jacobs Ladder Article.