I thought of keeping the Book of Sand in the space left on the shelf by the Wiclif, but in the end I decided to hide it behind the volumes of a broken set of The Thousand and One Nights. I went to bed and did not sleep. At three or four in the morning, I turned on the light.

I got down the impossible book and leafed through its pages. On one of them I saw engraved a mask. The upper corner of the page carried a number, which I no longer recall, elevated to the ninth power.

I showed no one my treasure. To the luck of owning it was added the fear of having it stolen, and then the misgiving that it might not truly be infinite. These twin preoccupations intensified my old misanthropy. I had only a few friends left; I now stopped seeing even them. A prisoner of the book, I almost never went out anymore.

After studying its frayed spine and covers with a magnifying glass, I rejected the possibility of a contrivance of any sort. The small illustrations, I verified, came two thousand pages apart. I set about listing them alphabetically in a notebook, which I was not long in filling up. Never once was an illustration repeated.

At night, in the meager intervals my insomnia granted, I dreamed of the book.