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Wherever they occur, religion and theatrical performance appear together. Performance theory, ritual theory, phenomenology, and even theology show how religion and theatre overlap, constitute each other, and are often indistinguishable from each other. Matters of study include monasticism and mysticism, bible drama in medieval Europe, Ramlila and Raslila theatre in India, Ta'zieh in Iran, Orthodox Christian liturgy, performance art, Palaeolithic cave art, and other related subjects (like video games).