I remember watching a documentary with Terry Gilliam (Python member, animator, and well famous director) who said he would go to the art gallery and just stare and stare at this painting, Venus, Cupid, Folly and Time by Agnolo Bronzino.
It is a very strange painting and it's easy to understand why someone would ponder it for hours. I mean look at the curve of Cupid's body and how his head just doesn't fit quite right. That old green hag in the middle of the left side of the painting looks like she is having a mental breakdown. Then there's the strange girls head to the right of Venus... what the hell is going on with her body? There's so much weirdness going on!
But what was it about this painting that caught Gilliam's attention? Take a look at Cupid's right foot. Look familiar?
For more about Terry Gilliam check out this great site http://www.smart.co.uk/dreams/