"Then I’ll teach you about it," said Paul, perching cautiously on the foot of her lounge chair. "Think of the virtuality pool as a kind of crème de menthe. All right? On the top layer is a breathable silicone fluid. We’ve put a trace of anandamine in it, just for fun. On the bottom is a malleable liquid. It’s something like the fusible liquids that our friend Eugene uses to cast sculpture. But it’s much more advanced and much more friendly, so we can swim inside it. It’s a buoyant, tactile, breathable, immersible virtuality."