I first became interested in philosophy in high school when I realized one day that all space is the same size; it is only the material boundaries encompassing it that differ. After that there came to me the realization (which I found later in Hume) that causality is a perception in the observer and not a datum of external reality. In college I was given Plato to read and thereupon became aware of the possible existence of a metaphysical realm beyond or above the sensory world. I came to understand that the human mind could conceive of a realm of which the empirical world was epiphenomenal. Finally I came to believe that in a certain sense the empirical world was not truly real, at least not as real as the archetypal realm beyond it. At this point I despaired of the veracity of sense-data. Hence in novel after novel that I write I question the reality of the world that the characters' percept-systems report.

This condensed history of philosophical influences tells only part of the story of Dick's development as a writer. There are, to be sure, a good number of philosophical and spiritual perspectives that mattered greatly to Dick but are not listed above. But a more basic factor was the difficult childhood Dick endured, which included the early divorce of his parents, frequent Depression era cross-country moves with his financially strapped and emotionally distant mother, and bouts of vertigo and agoraphobia that interfered with Dick's schooling and friendships and caused his mother to have him examined by at least two psychiatrists. One of these psychiatrists speculated that Dick might be suffering from schizophrenia -- a diagnostic possibility that severely frightened the boy and would haunt the grown man all his life.

Throughout Dick's speculations, there is the underlying sense of a dark pain and of shattering experiences that had left him grappling for his place in the shared world (koinos kosmos, in the Greek of Heraclitus, a thinker whom Dick greatly admired) and struggling to evade the madness of solitary delusion (idios kosmos, private world; from idios comes the English "idiot" -- one who is cut off from that which is happening around him).