In September 1977 at the 4eme Festival de la Science Fiction in Metz, France, surrealist author Philip K. Dick delivered an astounding address with the title, "If You Find This World Bad, You Should See Some of the Others." He wasn't joking. The speech spanned the themes that define Dick's work and also his life: visionary experiences, déjà vu, the simulation hypothesis, and the nature of reality. Far fucking out. Here are a few choice bits:
The subject of this speech is a topic which has been discovered recently, and which may not exist all. I may be talking about something that does not exist. Therefore I’m free to say everything and nothing. I in my stories and novels sometimes write about counterfeit worlds. Semi-real worlds as well as deranged private worlds, inhabited often by just one person…. At no time did I have a theoretical or conscious explanation for my preoccupation with these pluriform pseudo-worlds, but now I think I understand. What I was sensing was the manifold of partially actualized realities lying tangent to what evidently is the most actualized one—the one that the majority of us, by consensus gentium, agree on.
We are living in a computer-programmed reality, and the only clue we have to it is when some variable is changed, and some alteration in our reality occurs. We would have the overwhelming impression that we were re-living the present - déjà vu - perhaps in precisely the same way: hearing the same words, saying the same words. I submit that these impressions are valid and significant, and I will even say this: such an impression is a clue, that in some past time-point, a variable was changed - re-programmed as it were - and that because of this, an alternative world branched off.
I believe I know a great secret. When the work of restoration is completed, we will not even remember the tyrannies, the cruel barbarisms of the Earth we inhabited... the vast body of pain and grief and loss and disappointment within us will be expunged as if it had never been. I believe that process is taking place now, has always been taking place now. And, mercifully, we are already being permitted to forget that which formerly was. And perhaps in my novels and stories I have done wrong to urge you to remember.