Adult coloring books is the hottest new segment in publishing and everyone is getting involved. The coloring craze has even spawned all sorts of offline gatherings — coloring clubs, meet-ups, even coloring parties at bars. There is growing medical evidence that not only are adult coloring books stress revilers but contribute to your overall health. “We’ve always loved adult coloring books, featuring them from late 2012 when the ‘Colour Me Good’ Ryan Gosling and Benedict Cumberbatch titles were selling like hot cakes. By May, nine of the top 20 bestsellers were coloring books including the top eight books in the nonfiction category.