Definition of reality by Philip K. Dick

In the speech "How to Build a Universe That Doesn't Fall Apart Two Days Later" attributed to Phillip K. Dick (1978), he explains the motives that drove him to write, and a number of always current affairs:

It was always my hope, in writing novels and stories which asked the question "What is reality?", to someday get an answer. This was the hope of most of my readers, too. Years passed. I wrote over thirty novels and over a hundred stories, and still I could not figure out what was real. One day a girl college student in Canada asked me to define reality for her, for a paper she was writing for her philosophy class. She wanted a one-sentence answer. I thought about it and finally said, "Reality is that which, when you stop believing in it, doesn't go away." That's all I could come up with. That was back in 1972. Since then I haven't been able to define reality any more lucidly.

The Religious Experience of Philip K. Dick by R. Crumb

Philip K. Dick Fans website presents a Robert Crumb comics about Philip Dick's "Valis" experience, first published in Weirdo comic #17 from summer, 1986.

It is an interesting graphic interpretation of a series of events which happened to Dick in March of 1974. He spent the remaining years of his life trying to figure out what happened in those fateful months.

You will find all 8 pages of this story here. The file sizes are rather large (120-140K each) so that the text was readable and the detail visible.