Visitors to the 16th-century Scuola Grande di San Rocco in Venice, home to a spectacular cycle of wall and ceiling paintings by Tintoretto, are now able to view these masterpieces in a new light—literally. The 25 pictures in the Sala Superiore (upper hall) are being transformed by a project to clean centuries’ worth of grime from the sculpted marble that surrounds them, while a new LED lighting system has been installed in the Sala dell’Albergo. The three-year restoration project, which began in 2014, is sponsored by the luxury Swiss watchmaker Jaeger-LeCoultre.