 Walter Stace (1960) fixed the distinction between “extrovertive” and “introvertive” mystical experiences in philosophy of mysticism (also see Otto 1932, 57–72). When an experience includes sense-perception, it is an “extrovertive” experience. Mystical extrovertive experiences include consciousness of the unity of nature overlaid onto one’s sense-perception of the world, as well as non-unitive extrovertive experiences such as “cosmic consciousness.” When not extrovertive, an experience is “introvertive.” Examples include the experience of “nothingness” — an awareness lacking all differentiated content — and an awareness of God lacking sense-experiences.