rainbow

http://www.reelclassics.com/Musicals/Wizoz/rainbow-lyrics.htm

Somewhere over the rainbow
Skies are blue,
And the dreams that you dare to dream
Really do come true.

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http://en.wikipedia.org/wiki/Rainbow

A rainbow does not actually exist at a location in the sky, but
rather is an optical phenomenon whose apparent position depends on
the observer's location.

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http://en.wikipedia.org/wiki/Optical_illusion

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-Stephen