dream about, or for how long. You never knew if you would have a dream or a nightmare, a horror or a delight. This uncertainty has been removed from the modern Dream Shop. Nowadays, our drugs are carefully measured, mixed, and metered for each individual. There is an absolute precision in dream-making, ranging from the Nirvana-like calm of Black Slipper through the multicolored hallucinations of peyotl and tri-narcotine, to the sexual fantasies induced by nace and morphine, and at last to the memory-resurrecting dreams of the carmoid group."

"It's the memory-resurrecting dreams I'm interested in," Barrent said.

Arkdragen frowned. "I wouldn't recommend it for a first visit."

"Why not?"

"Dreams of Earth are apt to be more unsettling than any imaginary productions. It's usually advisable to build up a tolerance for them. I would advise a nice little sexual fantasy for your first visit. We have a special sale on sexual fantasies this week."

Barrent shook his head. "I think I'd prefer the real thing."

"You wouldn't," the assistant manager said, with a knowing smile. "Believe me, once one becomes accustomed to vicarious sex experiences, the real thing is pallid by comparison."

"Not interested," Barrent said. "What I want is a dream about Earth."

"But you haven't built up a tolerance!" Arkdragen said. "You aren't even addicted."

"Is addiction necessary?"

"It's important," Arkdragen told him, "as well as being inescapable. All our drugs are habit-forming, as the law requires. You see, to really appreciate a drug, you must build up a need for it. It heightens pleasure enormously, to say nothing of the increase in toleration. That's why I suggest that you begin with—"

"I want a dream about Earth," Barrent said.

"Very well," Arkdragen said grudgingly. "But we will not be responsible for any traumas which accrue."

He led Barrent into a long passageway. It was lined with doors, and behind some of them Barrent could hear dull moans and gasps of pleasure.

"Experiencers," Arkdragen said, without further explanation. He took Barrent to an open room near the end of the corridor. Within sat a cheerful-looking bearded man 

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