Here is another gorgeous plasma lamp that reacts to your touch and sound. The Luminglas 20-inch Flat Plasma Disk is the biggest of its kind we have tested. It has knobs in the back for adjusting pattern and sensitivity.
This plasma disk also has an adjustable stand built-in. Just like regular plasma globes, it can excite Neon, Argon, and other gases. The bad news? These are very hard to find and expensive.