Everybody has heard of Coal Miners using canaries to test the safety of deep mine shafts. Here's an example of the old method for testing the safety of caves in lion country. Please view the sources, as I rearranged the Rubens quite a bit.Sources: Rubens: Daniel in the Lion's Den (1613) Perino del Vaga: Nativity (1534) Please view the full versions of both entries.
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