Caravaggio is celebrated this summer in Rome with a once-in-a-lifetime meetup of paintings normally living in museums around the world. Colm Toibin, Orit Gat and Luke Clancy went to see that blockbuster in the Barberini - as well as the many Caravaggios that are permanent Roman residents - and then gathered to imagine what the painter might mean to the 21st century.

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