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Whether you call them nebula spheres, plasma lamps, or lightening balls, these lamps put on one of the most unique displays available. Twenty years ago they cost $1500. Today you can get one for as little as $40.
To understand how they work it's necessary to start off by explaining how a capacitor functions.
A capacitor is a device that can store an electrical charge. It's simply two parallel metal plates separated by an insulator. (For the sake of this explanation, the insulator is air.) If you connect a battery to one, for a brief moment current flows into one plate and out of the other, storing a charge on each. The capacitor is constantly being charged in one direction, then the other. With each pulse there is a short period when current is flowing through the wires to and from the capacitor even though, again, no current passes between the plates of the capacitor.
If instead of just one battery, connect hundreds in series and eventually there'd be enough voltage for a spark would jump across the gap. Ionized air is a conductor and electricity flows through it. While this is happening, some electrons go from being ionized back to being un-ionized. When this happens they give off a flash of light. The color of this light depends on what type of gas is used. Now, if the batteries were replaced with a pulsing power supply, the sparking would be continuous. If the pulse rate, or frequency, was fast enough the sparks would blur together and appear to give off a steady light.
The next step is to enclose the capacitor in a glass sphere filled with gas. Because more current passes through these streams it glows brighter. These brightly glowing streams are the streams that make up the light show in a sphere. The gases used in plasma spheres are usually argon, neon and nitrogen, which produce blue, red and white colors. Since warm gas rises, the glowing streamer rises with it. That's why glowing steamers are always moving upward in plasma spheres.
The reason you don't feel anything when you touch the sphere is that no current passes through the glass shell and into your finger. Current's jumping back and forth between the central electrode and the inside of the glass sphere so fast you can't see the individual pulses. One trick with plasma spheres is to hold a fluorescent light near one.
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