[All the above are my own contraptions.]
Update: Image sources below the break.
Duomo Oculus somewhere in Italy, photographed by a friend.
Duomo di Orvieto – le cappelle laterali.
Chopped & cropped and pasted it over the lower .gif. Posted previously here via here.
Tacky Raccoons 
It’s cool.
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WAAO– I added an update with the source images.
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