How does a plasma ball work?

It also know as the plasma globe. Well, you prob seen one at Spencer Gifts. That scary orb with lightning inside like a mini Tesla coil.

Plasma ball is filled with low pressure gas, mainly neon, and it generates a high voltage inside like a mini Tesla coil or neon sign transformer. This is what causes the spectacular display of color. Hold up a small spring bulb to the HDR plasma ball to see it light up.