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The Pantheon Oculus, a 25-foot-wide circular opening at the top of the dome, is the sole source of natural light inside the ancient Roman temple. It also serves as a sundial, casting changing beams of sunlight onto the interior floor during the day. During the spring and fall equinoxes, a particularly bright light spectacle occurs, captivating visitors. Photo by Mats Silvan / Getty Images. https://www.thoughtco.com/influencial-architecture-of-the-pantheon-177715