The use of triptychs expanded beyond Christianity during the Renaissance, with artists including Hiëronymus Bosch incorporating secular themes. Triptychs were also adopted by other religions, including Islam and Buddhism. In the 20th century triptychs gained popularity in modern art and were made by such artists as Francis Bacon and Roy Lichtenstein, usually eschewing religious themes. In film, director Abel Gance adapted a triptych format in Napoléon (1927) using Polyvision, with three synchronized cameras and projectors.