Universal Judgment, Michelangelo: as seen with old lighting, L.; with new lighting, R.

Delphic Sybyl by Michelangelo under old lighting (L.) and under new lighting (R.)  

The exterior air conditioning system, invisible inside (L.); Visible from St. Peter's Square: the 180-foot crane that extended atop the Sistine Chapel  

Inside view of the new air conditioning system