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The fundamental principles of Spiritism are: (i) A belief in the existence of spirits - non-physical beings that live in the invisible or spirit world - and (ii) the possibility of communication between these spirits and living people through mediumship. There is a clear difference, according to Kardec, between the terms "Spiritism" and "Spiritualism"; the latter is the "opposite of materialism", a belief that "there is something...more than matter" but it does not necessarily follow that a spiritualist "believes in the existence of spirits, or in their communication with the visible world."