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Black and white are condensed rainbows
(literature.cafe)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
What do you mean? "Rainbows" relate to frequency while shadows correspond to intensity.
Exactly. Rainbows are a rare phenomenon, shadows are common.
Edit: I have an entire custom software that I wrote to process this very basic concept.