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----------------------------Original message---------------------------- Does anyone know the term for an image which reads right side up as well as upside down? In a frontispiece of a book published in France in 1794 there is a portrait of a nobleman which reads as a beggar when you flip the book upside down. We were asked for the correct term to describe this phenomenon as the book is being used in an exhibition. We already tried BHA and AAT terms. THANKS.