How electricity is delivered.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...k_fullsize.jpg
Actually I'm guessing this is some sort of electricity safety training device, like the one in this 22:10 video:
Previously:
Flamethrowing drone for clearing electric wires - GIF
Electrical tower fire and collapse on busy street - GIF
Electrical lineman slides down power lines - GIF
Melting a wrench with electricity - GIF
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