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The main idea of this paragraph:
A rainbow is seen when light from the sun reflects off of fallen rain. You can see red, orange, yellow, green, blue, indigo, and violet. First it has to rain. Then the sun has to come out and shine onto the wetness. After the rain has stopped, you can look into the distance and see a beautiful rainbow. But you can never touch it, because it is really just an illusion.
What is "A rainbow is seen when light from the sun reflects off of fallen rain."