"At first he could not get the hang of it then suddenly did. The bubbles hesitated on the rim of the pipe-bowl, wobbling flabbily, then broke free and floated sedately away. They seemed to be rotating inside themselves, as if the top was always too heavy, and the iridescent surplus kept cascading down the sides. Sometimes two of them stuck together and formed a fat, trembling shape something like an hourglass only squatter. They were made of an unearthly substance, a transparent quicksilver, impossibly fine and volatile, rainbow-hued. They popped against his skin like wet, cold kisses."