Why Was A Tiny Dirt Patch Left On The Ceiling Of Grand Central Terminal?

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https://gothamist.com/arts-entertainment/why-was-a-tiny-dirt-patch-left-on-the-ceiling-of-grand-central-terminal

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Narrative

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When Grand Central Station was cleaned up in the 90s, a small patch of grime was left so people would be reminded of how dirty it used to be.