Until 14th April 2019 the exhibition “not authorized by the artist”, the mysterious Banksy, is on at the MUDEC in Milan. The works on show are photographs belonging to Butterfly Art News, by the French couple who discovered Banksy’s murals on the walls of London and decided to photograph them.The originals have probably been deleted. And conjectures about Banksy, who has become famous without ever revealing his identity, have multiplied. His message, however, is certainly effective.