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The belief that the soul projects out of the body and into mirrors in the form of reflection underlies perhaps the most widely known mirror superstition: that breaking a mirror brings seven years' bad luck. Many believed that breaking a mirror also broke the soul of the one who broke it. The soul, so angered at being hurt, exacted seven years of bad luck in payment for such carelessness.
Magic mirror - might be good for something.
All Mirrors Are Magic Mirrors - 1972 exploration of illustrated children's books - Color Plates. $14,00, via Etsy.