[ErikAugust]

Ubik? Though that is not about artificial personality constructs, it's about communicating with loved ones in half-dead states.

[pmoriarty]

Yes, Ubik has half-life states.

But I'm thinking of a different PKD book where there were actual artificial personality constructs instead.

[iainmerrick]

This idea crops up in a few of his novels and stories, but I think it’s most fleshed-out in Ubik, yeah.

[xkcd-sucks]

Under the hood they are all about religious Gnosticism and the physical universe as a false facade to the "true" universe. VALIS is a pretty good explication as well as a really good book; if you are into mental illness+theology, only then is his Exegesis a good read

[iainmerrick]

Very belatedly, yes, VALIS is strange and wonderful.

This is making me want to re-read some PKD!