My favorite K Dick (of those I read ...)! A book that bring back memories for those who tested LSD ... What is reality? The realities produced by projections of our consciousness ... The different layers of reality ... In the course of reading we do not know what to hang, like the main character ... Is it under effect of psychotropic substances? Thus, swirls with him popping up all borders of our subconscious, to madness? ... Finally, a book for "insiders" with hallucinogenic or for those who want to have an idea of their effects or which may happen in the mind of a psychotic paranoid! Excellent !!!