Putting aside Dick"s ability to foreshadow the future we now take for granted, his most unnerving vision was of the world itself ultimately being a simulation. Dick"s reality was already a fragile and complex one. In many of his later books, the idea of reality being a façade grew as a dominant theme. "Dick argued we were existing in a simulation," Peake suggests. "Elon Musk caused controversy quite recently by effectively venturing the same idea."