An illustration of an hourglass that is part of Albrecht Dürer's Melencolia I. Hourglass is found between the scales and Dürer's Magic Square.
Man’s Evolving Images, Printing and Writing Mural
Coates Library, Trinity University
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James Sicner, “Hourglass,” The Coates Library Mural, accessed November 27, 2020, https://mural.coateslibrary.com/items/show/32.