A conical glass enclosure - sizes vary between 200mm and 1500mm tall - with a tapered core, on which are rings at different voltages to produce the "branch" effect of plasma tendrils. Argon gas would give the green colour.

Prior Art acknowledged.

Do not water.
-- 8th of 7, Dec 06 2019

Plasma ball decorations _22Plasma_20ball_22...mas_20tree_20lights
"Tree" idea mentioned in [neutrinos_shadow] annotation. [8th of 7, Dec 06 2019]

How low a pressure is needed to sustain the plasma? Could one convert, say, a mid-sized conservatory into a low-pressure oxygen chamber complete with plasma? I know I've seen a guy who wears a chain-mail suit and pulls huge arcs from Tesla coils.
-- MaxwellBuchanan, Dec 06 2019


//..1500mm tall//
Why so small? Gas pressure issues notwithstanding, it needs to go at least to the ceiling, if not "we're going to need a bigger house" size.
-- neutrinos_shadow, Dec 08 2019


You pays your glassblower, and you takes your choice ...
-- 8th of 7, Dec 08 2019



random, halfbakery