Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net> What's the biggest plasma sphere (i.e. a TC running inside an evacuated chamber that has been backfilled with some interesting gas) that has been built? Are any details available? I've been asked about the feasibility of building a 4 foot(ish) diameter hemisphere or spherical display.