Coloring books, Lowenfeld wrote, can reinforce "stereotypes." There's a fascinating illustration in his book that, well, illustrates this: Give kids a blank sheet of paper and ask them to draw a bird.

This piece was updated on Sept. 2, 2018. Crayons, of course. Scented markers. Colored pencils, pre-sharpened. And coloring books by the jillions. Why do people like coloring so much? For grownups ...

How Coloring Books (for Kids and Adults) Ended Up in Restaurants. ... The design of the menu is simple, featuring two young girls in the kitchen, one cooking and the other tasting soup.

This patent coloring book from the U.S. National Archives and Records Administration has some of the craziest inventions you'll ever see. Guaranteed.