Labyrinths (New Directions Paperbook)

One of the schools of Tlön goes so far as to negate time: it reasons that the present is indefinite, that the future has no reality other than as a present hope, that the past has no reality other than as a present memory.

For one of those gnostics, the visible universe was an illusion or (more precisely) a sophism. Mirrors and fatherhood are abominable because they multiply and disseminate that universe.

Borges once claimed that the basic devices of all fantastic literature are only four in number: the work within the work, the contamination of reality by dream, the voyage in time, and the double.