Georgia State's Milbrandt explained this further: "When you look at a coloring book, you say, 'Who's making the decisions here?' The image is already there, with little opportunity for the child ...

The inside features different images of animals ... This design wasn’t revolutionary: Children had been using coloring books since the McLoughin Brothers released the The Little Folks ...

Colouring books used to be fun. When did they get so . . . mindful ... barely large enough to fit the nib of a pencil – receded to infinity. Looking at the image, I felt faintly distressed. Nothing ...

The pencil industry is suffering a shortage of pencils thanks to the popularity of adult colouring in books. The craze is sweeping the world as grown ups seek to switch off their electronic ...

Similarly to adult colouring books, the designs look sophisticated but hark back to a popular childhood pastime. The books contain colourless images with numbers, with a corresponding sticker ...

The Duchess of Cambridge enjoys colouring-in books, her husband has told a top ... YUI MOK/AFP/Getty Images Reflecting on the popularity of the craze, she said: "I think people are just craving ...