“Say—five hundred dollars?” asked Mr. Emurian, smiling behind his eyeglasses. “No? Not even a thousand? I will give you the address of the man who would buy it, if you ever wish to sell.”

Tony was too flabbergasted to even shake his head.

Mr. Emurian laughed. “This man,” he explained amiably, “would say that the coin comes from a country which is not upon our maps because it is unapproachable by any ordinary means. Yet it is wholly real and actually has a certain commerce with us. It is—hm—have you ever heard of worlds supposed to be like ours, but in other—ah—dimensions, say, or in parallel but not identical times?”

“I’ve read Wells’ Time Machine,” said Tony awkwardly.

“Not at all the same,” the dark man assured him. “And notions of startling new machines for traveling between sets of dimensions or in time itself are quite absurd. Discoveries of that sort are never drastic! When electricity was discovered, it was your own Franklin who observed that it was no new force, but quite commonplace. Every thunderstorm since time began had demonstrated it. Similarly, if travel between worlds or to other times should ever become really practical, it is certain that the discovery will not be dramatic. It will turn out that people have been doing it for centuries as a matter of course, without ever realizing it.”

“You mean—” Tony stopped.

“The legend,” said Mr. Emurian, “suggests that your coin came from a world not our own. That it came from a world where history quite truthfully denies much of the history we truthfully teach to children.” He regarded Tony zestfully and said, “Ordinarily, two things which are equal to the same thing are equal to each other. But two places which are exactly equal to each other are identical—are the same place. Now consider! Suppose that somewhere there existed a world in which Aladdin’s lamp existed and was in good working order. Suppose that upon that world there was a place which was absolutely identical with a place in this world.