The computer guy rotates the case around in his hand a few times, just to get a feel for it. Then he slides it into a large open-ended cylinder that is resting on the top of a table. The walls of the cylinder are a couple of inches thick. Frost appears to be growing on this thing. Mystery gases continuously slide off of it, like teaspoons of milk dropped into turbulent water. The gases plunge out across the table and drop to the floor, where they make a little carpet of fog that flows and blooms around their shoes. When the computer guy has it in place, he yanks his hand back from the cold.