there is a very high probability in favour of the existence of many worlds exactly like the Earth, on the surface of which the same history is accomplished, and the same succession of historical events takes place; worlds which are inhabited by identically the same species of vegetables and animals, and the same humanity, and where men and families like our own, I doubt not, exist.

In the second place, I asked myself if another world analogous to the Earth might not also be symmetrical to it; and then I worked out the geometry of the problem, and the metaphysical theory of images. I arrived at the conclusion that it was possible for the world in question to be like the Earth, but in an inverse form. When you look at yourself in a mirror, you notice that the ring on your right hand appears to be on the ring-finger of your left hand. This explains the symbol. If you wink your right eye, your reflection winks the left eye; when you advance your right arm, your image advances the left arm. It is not impossible that in the infinity of the stars a world exists exactly the converse of the terrestrial world. Undoubtedly in an infinity of worlds the non-existence of a similar world, perhaps of millions of them, would be the real impossibility. Nature of necessity repeats herself, reproduces herself, but still under all forms plays the game of creation. I thought therefore that the world on which I saw those things was not the Earth, but a globe like the Earth, the history of which was precisely the opposite of yours.

I myself have had the idea also that it might have been as you say. But was it not easy for you to make sure of it by ascertaining whether it was the Earth or another star that you had before your eyes, by examining its astronomical position?

That is precisely what I did immediately, and this examination confirmed me in my opinion. The star where I had just witnessed four facts, analogous to four terrestrial facts, but inversely, did not appear to me to occupy its original position. The little constellation of the Altar no longer existed, and on that side of the heavens where you remember the Earth appeared to be in my first episode, there was an irregular polygon of unknown stars. I was thus convinced that it was not our Earth that I had before my eyes. I could no longer feel any doubt about it, and I was satisfied that I had now, for my field of exploration, a world so much the more curious that it was not the Earth, and that its history appeared to represent, in an inverse order, the scenes of the history of our world.

Some events, it is true, did not 

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