The Book of Sand - in "The Library of Babel"

In "The Library of Babel"

The last note to Borges's short story "The Library of Babel" briefly imagines a similar book, and links it to the work of the well-known mathematician Bonaventura Cavalieri:

…his vast Library is useless: rigorously speaking, a single volume would be sufficient… containing an infinite number of infinitely thin leaves. (In the early seventeenth century, Cavalieri said that all solid bodies are the superimposition of an infinite number of planes.)