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The “Temple of Time,” created in 1846 by the pioneering American girls’ educator Emma Willard, draws on the tradition of Renaissance “memory theaters,” mnemonic devices that allowed people to memorize information by imagining it as architectural details in a three-dimensional mental space. The vertical columns represent centuries, with those on the right showing names of important figures from the Old World while those on the left show figures from the New World.

This stereogram of the Swedish census for the years 1750 to 1875 shows the number of male births each year in relation to the number of survivors. It was created in 1879 by the Italian demographer Luigi Perozzo.

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