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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Book trends in 2016: Paper is popular, science fiction rises, long-form nonfiction dips - Los Angeles Times

25 Best Adult Coloring Books 2022

How adult coloring books became a million-dollar trend

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Million Dollar Drawing at GetDrawings

Kappa Books Publisher Adult Coloring Books Easy Pack, Price/24 /pack