How adult coloring books became a million-dollar trend

Adult coloring books came out of nowhere last year to sell millions of copies. What's behind the sudden craze of coloring inside the lines?
Adult coloring books came out of nowhere last year to sell millions of copies. What's behind the sudden craze of coloring inside the lines?

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How adult coloring books became a million-dollar trend

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How adult coloring books became a million-dollar trend

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