Bold, bright, contrasting colors Crinkle sound engages baby Introduce baby to animals while playing peek-a-boo Black and white link for on-the-go use Stimulate baby's senses with the Peek-a-Boo Activity Book. The bold, high-contrast colors, multiple textures and crinkle sound help accelerate baby's mental growth and awareness of her surroundings. Plus, the peek-a-boo flaps strengthen hand-eye coordination. The Sassy Peek-A-Boo Activity Book Features: Peek-a-boo flaps strengthen hand-eye coordination