The No. 1 and No. 2 best-selling books on Amazon right now are colouring books for adults. Let that sink in for a few minutes. And it's not just a fluke - there are several other colouring books for adults now hitting the bestseller lists around the world. In fact, in Britain, five of the top 10 titles are now adult colouring books.
What's going on here?
The best theory offered to date is that best-selling adult colouring books such as Secret Garden and Enchanted Forest are all about easing stress and calming one's inner child. From this perspective, colouring is all about regaining mindfulness and getting a digital detox. And, indeed, the best-selling Scottish illustrator and "ink evangelist" behind these books, Johanna Basford, recently told The Guardian: "I think it is really relaxing, to do something analogue, to unplug . . . Colouring books are also an easy way to flex our creative muscles in a way we likely haven't since our good old paste-eating elementary school days."
However, explaining the phenomenal success of colouring books for adults in such a way can't also explain the strange evolution in reading tastes around the world, which has seen an explosion in the popularity of certain genres that might have been considered "childish" just a generation ago. After all, it's not just colouring books that are hot - it's graphic novels, comic books and especially, young adult titles such as Harry Potter and Hunger Games.
In 2014 alone, young adult titles represented the fastest-growing segment of the book market, as well as the fastest growing genre amongst all e-books. So here's an alternative theory for why a colouring book is No. 1 on Amazon these days: our digital reading habits are breaking down what might once have been the embarrassment of reading certain kinds of books. In other words, the relatively anonymous experience of purchasing books online and reading them on e-readers is making it easier to consume certain types of content. Nobody really knows what you have on your e-reading device, and so you can experiment in ways that people won't judge you for later. That assumption is borne out, to some degree, by looking at the data for young adult novels. It's actually old adults, not young adults, who are purchasing these books in the greatest numbers. And e-book sales are up nearly 53 per cent in the YA/children's book category.