Don't be afraid of the dark - it hides all manner of secret surprises! From our creative kindred souls at Hat-trick Design, this interactive picture book features images hidden ingeniously inside its illustrations - literally. To reveal the surprise on each page, turn out the lights or snuggle under the covers, then fire up your flashlight. Who knows what you'll find? Knock Knock was founded in 2002 by Jen Bilik with the mission of creating witty, design-driven gift products and books, along with anything else that might strike the Knock Knock fancy. Our products aspire to bring humor, function, organization, and aesthetics to everyday life. We believe that people are intelligent enough to appreciate wit, wordplay, and conceptual thought. Whether we re producing sticky notes or a volume of thoroughly researched nonfiction, we strive not to dumb down as we create. Our sensibility remains proudly distinct.