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The End of the Rainbow

The retina is the exposed surface of the brain, so if you think about a pot of gold while looking at a rainbow, then there's one at BOTH ends.
Alt-Text (der eigentliche Witz)
The retina is the exposed surface of the brain, so if you think about a pot of gold while looking at a rainbow, then there's one at BOTH ends.
xkcd von Randall Munroe – Original auf xkcd.com CC BY-NC 2.5