Plasma hourglass with phosphor-coated beads electrified by plasma.
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Previously:
https://www.homemadetools.net/forum/...085#post184293
https://www.homemadetools.net/forum/...225#post153958
https://www.homemadetools.net/forum/...621#post143372
https://www.homemadetools.net/forum/...242#post176856
https://www.homemadetools.net/forum/...496#post158697
