In the past few years, we have tested a whole host of amazing plasma lamps here. The Obelisk Audio Reactive Plasma Lamp is also worth a look. It is a sound reactive obelisk that reacts to your touch. It doubles as a physics toy to excite pure gas tubes.
This plasma lamp has a button in the back that lets you change mode. It measures 21″ tall in total. You can remove the hood if you prefer.