October 14, 2004
But the really amazing feature of the ceiling is the dome. There is a bronze dot on the floor between two stars. If you go stand on it and look up, you will see a beautiful renaissance dome arching above the floor. Really a lovely one with lots of architectural details. If you walk forward until you are under the dome, you can see that there is indeed no dome; the church ran out of money before it was installed. Instead there is the carefully painted illusion of a dome on the ceiling, which becomes obvious only if you look at it from the right angle.
From journal Roman Pilgrimage