“World Atlas,’’ written by Nick Crane, illustrated by David Dean, and recently released by children’s publisher Barefoot Books, is an unconventional beauty. Land masses are divided into regions, not continents, which makes sense, especially in a place as vast as Asia. Maps in a palette of purple and gold feature not a grid of latitude and longitude lines but icons of animals, landmarks, and manmade features, such as the Rubik’s cube invented by a Hungarian professor. Flaps scattered throughout the book ask: Did You Know? Lift up for the answer. That’s how I learned it’s fat, not water, that makes a camel’s hump.