Well, you're not alone. In fact, there are enough of you out there to have made sell-out successes out of not one, but two grown-up coloring books by illustrator Johanna Basford. Her first book, 2013's Secret Garden, sold nearly one and a half million copies worldwide. Her latest, Enchanted Forest, came out in February.
Basford tells NPR's Audie Cornish why she thinks her books have been such a hit.