Over the course of his long and illustrious career, Dr. Seuss wrote dozens of children's books. Among his most famous books is And to Think I Saw It on Mulberry Street (first published in 1937), which tells the story of a young boy named Marco. Marco is a nice and observant boy who one day sees imaginary people and vehicles traveling across a road.
When it was released, And to Think I Saw It on Mulberry Street received glowingly positive reviews, but didn't sell much. Acclaimed author Beatrix Potter, for example, absolutely adored the book. In a letter she wrote about the book, she wrote that this is "an amusing picture book ... I think it the cleverest book I have met with for many years. The swing and merriment of the pictures and the natural truthful simplicity of the untruthfulness ... Too many story books for children are condescending, self-conscious inventions—and then some trivial oversight, some small incorrect detail gives the whole show away. Dr. Seuss does it thoroughly!"