Dualism in Indian philosophy refers to the belief held by certain schools of Indian philosophy that reality is fundamentally composed of two parts. This mainly takes the form of either mind-matter dualism in Buddhist philosophy or awareness-'nature' dualism in the Samkhya and Yoga schools of Hindu philosophy. These can be contrasted with mind-body dualism in Western philosophy of mind, but also have similarities with it. Another form of dualism in Hindu philosophy is found in the Dvaita ("dualism") Vedanta school, which regards God and the world as two realities with distinct essences; this is a form of theistic dualism. By contrast, schools such as Advaita ("nondualism") Vedanta embrace absolute monism and regard dualism as an illusion (maya). Buddhist philosophy During the classical era of Buddhist philosophy in India, philosophers such as Dharmakirti argued for a dualism between states of consciousness and Buddhist atoms (the basic building blocks that make up reality), according to the "standard interpretation" of Dharmakirti's Buddhist metaphysics. Samkhya and Yogic philosophy While Western philosophical traditions, as exemplified by Descartes, equate mind with the conscious self and theorize on consciousness on the basis of mind/body dualism, some Eastern philosophies provide an alternate viewpoint, intimately related to substance dualism, by drawing a metaphysical line between consciousness and matter — where matter includes both body and mind. In Samkhya and Yoga, two of the six orthodox (āstika) schools of Hindu philosophy, "there are two irreducible, innate and independent realities: 1) consciousness itself (Purusha), and 2) primordial materiality (Prakriti)". The unconscious primordial materiality, Prakriti, contains 23 components including intellect (buddhi, mahat), ego (ahamkara) and mind (manas). Therefore, the intellect, mind and ego are all seen as forms of unconscious matter. Thought processes and mental events are conscious only to the extent they receive illumination from Purusha. Consciousness is compared to light which illuminates the material configurations or 'shapes' assumed by the mind. So intellect after receiving cognitive structures form the mind and illumination from pure consciousness creates thought structures that appear to be conscious. Ahamkara, the ego or the phenomenal self, appropriates all mental experiences to itself and thus, personalizes the objective activities of mind and intellect by assuming possession of them. But consciousness is itself independent of the thought structures it illuminates. By including mind in the realm of matter, Samkhya Yoga avoids one of the most serious pitfalls of Cartesian dualism, the violation of physical conservation laws by involving