Dome Of The Museum-Church Of San Juan De Dios.

In the center of the dome, ten small windows, four of which allow light to pass through the outside, and the other six that look like they are closed, are painted, that is, real illusions.
Below and between the spaces of the ribs of the dome, there are ten medallions with scenes from the life and miracles of San Juan de Dios.
More about this Museum-Church, here.