Reality is that which, when you stop believing in it, doesn't go away.
Source: Definition given in 1972; quoted by Dick in I Hope I Shall Arrive Soon, How to Build a Universe That Doesn't Fall Apart Two Days Later, Introduction, 1986.
-- Philip K Dick, (Dec 16 1928-1982), US science fiction writer; He is a science fiction author who won the 1962 Hugo award for Man in the High Castle.