Last month, rapper 2 Chainz decided to rent out a house in Atlanta, paint it a nice shade of Pepto-Bismol pink, scrawl the word "trap" across the front, and open it up to the public as a sort of ad hoc art installation — you know, just normal stuff, as one does.

The whole thing was a marketing gimmick to promote his latest album, "Pretty Girls Like Trap Music," and the project quickly took on a bit of a life of its own.

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