In "Eye to Eye," Ken Wilber applies his spectrum of consciousness model to epistemology. Each of the realms in the spectrum (grossly simplified as body, mind, spirit,) according to Wilber, can be investigated in accordance with its own nature, or with the appropriate "eye." That is, the "eye of flesh," the "eye of mind," and the "eye of contemplation." Investigation of one realm with the eye of another produces, at best, a limited, or representational, understanding (as Kant pointed out with respect to the eye of mind), and at worst, what Wilber calls "category error." Attempting to investigate the realm of spirit, for example, with the "eye of flesh," that is, the eye that perceives only sensory phenomena, will not yield real knowledge of the realm of spirit, which is not disclosed to sensory perception. This results in errors like "empirical" science, which purports to recognize only sensory phenomena, declaring the realm of spirit to be nonexistent or at least non-verifiable, because it cant be "seen." Well, it cant be seen unless you look with the right "eye." Wilber explains why it is critical that the proper "eye," and the corresponding modes of investigation and verification, are used to investigate, and establish validity claims in, the various realms in the spectrum of consciousness. More importantly, he says that all these realms can indeed be known, and that the validity of such knowledge can be tested and verified by the same "scientific" method now applied to the material and rational realms, provided the proper eye, and the proper verification protocols, are used. This consitutes nothing less than a breakthrough in the logjam of modern epistemology.http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/157062741X/customer-reviews/qid=1020468983/sr=1-1/ref=sr_1_1/104-4891815-5926353
