Bogard used argon in his plasma-ball system. Argon produces lavender streamers at low applied voltage. The streamer at the left is grounded to his fingertip.

Krypton produces white streamers that look like lightning.

This globe contains 95% neon and 5% xenon—which produces the blue part of the streamers.

A mixture of 95% neon, 2.5% xenon, and 2.5% krypton lends this globe its green streamers and orange pads.

Pure neon produces bright reddish orange streamers.

Parker installed the largest plasma ball in Europe at the Technorama, in Winterthur, Switzerland.

This vertical plasma tube, designed by Parker, can be found at the National Museum of Natural Science, in Taichung, Taiwan.

Plasma patterns hug this Parker-designed tube at the Saibu Gas Museum, in Fukuoka, Japan.

Parker installed this globe at the CosmoCaixa museum, in Barcelona, Spain. Someone's hand (at right) is drawing a streamer to it and appears to be illuminated.