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The Sistine Chapel ceiling - Michelangelo di Lodovico Buonarroti Simoni (1508 - 1512)
(upload.wikimedia.org)
Wander the gallery. Look at the art. Be polite. If you feel able please post some great art :)
My favorite part is the snake with the skin like a human, in the garden of Eden. That always freaked me out as a kid.