Explores the philosophical ramificataions of virtual reality (VR). Zhai (philosophy, Muhlenberg College) argues that whatever reasons we have for justifying the materiality of the actual world are equally valid for justifying the materiality of the virtual world once we are immersed in it. From this premise, he examines the causal and the digital within the virtual realm, the fallacy of unity projection, the meaning of life and VR, and VR and the destiny of humankind. Annotation c. by Book News, Inc., Portland, Or.