Hemispherical is a closed chamber like a hemispherical casket. Air locked. I used to sell hemispherical chillers. Kinda like the chiller produced installed in the autos. Some how, yes me, the Hickster spread the idea over the net and the dude from Australia kind took the idea and ran with it. That's fine,, I got enough money to die with. Nope. At least El Ri Cola knows the truth isims.