I reflected that there is nothing less material than money, since any coin(a twenty centavo piece, for instance) is, in truth, a panoply of all possible futures. Money is abstract, I said over and over, money is future time. It can be an evening just outside the city, or a Brahms melody, or maps, or chess, or coffee, or the words of Epictetus, which teach the contempt of gold; it is a Proteus more changeable than the Proteus of the Isle of Pharos. It is unforeseeable time, Bergsonian time, not the hard, solid time of Islam or the Portico.
Jorge Luis Borges