This series of board books was specially designed in black and white for toddlers, based on the theory of Maria Montessori. The world-famous Italian educator noted how babies first distinguish, and enjoy, high contrast images like these, providing visual stimulation for newborns and just right for baby's developing brain. This series contains more than 64 different exercises for the visual sensitive period and the slide-and-pull tabs provide yet another way to interact with the book. A visually appealing and unique collection!