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I'm no expert but I'm pretty good at physics and I'd guess the electricity is flowing through a lot of gas all around, but that little sphere happens to get hot and its resistance increases. As a consequence that ball becomes a focus of heat generation.
Another possibility is that two opposing planes have a potential difference between them. It may be that the shortest path for the electricity is the shape of two opposing pyramids with their points touching, one of them upside down. The focus of current where the points of the pyramids meet heats up due to the current per square inch being so high.
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