[sdiy] Using a plasma ball as a control surface?

[cheater00 cheater00]

Hi, I was wondering if anyone tried using a plasma ball as a controller for
an electronic circuit. I just think it would be pretty cool. The question
really becomes how you could figure out where the beas hit.

Could you send mechanical waves through the dome? Maybe this would modulate
the current, then based on phase difference (=delay) you could triangulate
the beam location on the sphere. If you put two transducers at the very
bottom of the sphere you might even only need to diangulate.

Could one build an electrostatic grid that would tell where the beams go
through? Could this be scanned in an x-y scheme, like eg a pc keyboard?

Has anyone got any ideas?

Thanks
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