If you enjoyed this, Jean Baudrillard's <i>Simulacra and Simulation</i> is what he has drawn heavily upon. He talks extensively about the "hyperreal" mental reality we exist within.<p>If you enjoyed that, you might like Phil K Dick's existential works like <i>Flow my tears</i>, <i>cantata 140</i>, hell anything of his almost. Even "the defenders" is a full on frontal assault on reality.<p>Finally, if you want to go clean off the deep end, read his Exegesis and Valis.