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. It would have to be a place where the working or not working of Aladdin’s lamp made absolutely no difference. Now, according to the legend, those two places, on two worlds, would actually be one place which was on both worlds, and which would serve as a perfectly practical gateway between them. Travelers would pass casually through it without ever noticing it. You and I perhaps, pass through such gateways every day without the least realization.”
The dark man seemed to find amused satisfaction in the look of mystified enthusiasm on Tony’s face. He waved a manicured hand.
“Look at this restaurant. Here. Tonight,” he said, beaming. “Today, for example, Calcutta could have vanished in a tidal wave and be sunk forever under the sea. Or it could not. Here and now, we knowing nothing about it, such an event would still have made no slightest difference. So that from this restaurant tonight we could walk out into two different worlds—you into the one where such an event had taken place, and I into the world where it did not. And I might go and live peacefully and die of old age in the Calcutta which to you was utterly destroyed.”
“But we are in the same world!” protested Tony. “We’ll stay in the same world!”
“Probably, but are you sure?” Mr. Emurian twinkled through his glasses. “We have never seen each other before. How do you know that I have always lived in this particular world? How do you know that the history of the world in which I was born is the same? I was surely not taught the same history! And if we separate here tonight, and you never see or hear of me again, how will you know that I remain in the world you inhabit?”