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Possession, understood by Leiris as "... losing one's head in a trance ...", points towards the concept of the "acephalous" (headless). In this concept several strands of Bataillean thought are brought together. For Bataille, the head’s function is utilitarian, and opposed to collective effervescence. Losing one's head means an ecstatic subversion of egotistic calculation. Possession was presented a method to lose oneself in Dionysian ecstasy, like expenditure, sacrifice, transgression, laughter and tears, ecstasy and madness, vice and revolt, eroticism and death.