World's smallest library pops up on New York sidewalk with just 40 books.The smallest library in the world has appeared on the streets of New York City - and it has space for just one reader at a time.The bright yellow plastic structure houses 40 books and aims to help city-dwellers take a break from the pace of life in the metropolis by chilling out with a good story.The Little Free Library was designed by a pair of innovative architects using recycled materials to protect the books inside from the elements..It was constructed from a plastic water tank and a wooden frame, with holes in the exterior allowing visitors to look in before they enter the structure. [Photo/icpress]