Ubik is a masterpiece that challenges reality in a multi-layered, faceted take on Plato's allegory of the cave. Likely the precursor to The Matrix, and presented like a fun, fast-paced, yet deeply thematic futuristic story.
In short, a masterpiece as only PKD could craft.
My full review: liviajelliot.substack.c…
(And if you’re interested, there is also a full on philosophical analysis, linked at the end of the review.)