Illustrator Millie Marotta of London, England, recently visited Philadelphia to explain the benefits of coloring as an adult.

If you’ve paid any attention to Internet trends lately, or been inside a bookstore (or perhaps done both – good on you, manic pixie dream girl) you’ve likely heard of something called “adult coloring.

So pick up a crayon and colouring book next time you feel the need to switch off. Where can you buy one? The good news is - just about anywhere! There are so many options out there.

Sir Quentin Blake, one of Britain’s best-loved illustrators, claims that colouring books are a constraint on children’s imaginations. So why are adults taking up the hobby?