"You've proved that you exist," I said, "but in a dream everyone I meet is myself! Behind your face am I, dreaming I am you, encountering myself in a dream not as self but other. I don't know how or why but that's the only sober explanation. I am I and I am you, why not? If a mind can divide itself into subject and object—as it must to make experience possible—why not into subject and subject? That's what you proved. Not that you are Descartes. That I am more than one self!" [...] "I am here, I am I and I am there, I am you. I could of course be mistaken—you might be only an apparition, an empty mask—but you've given me sufficient reason to believe I am there behind your imaginary eyes, masked from myself. I am not one self in one world but many selves in many worlds, the universe within."