Caillou: Tell Me What (Peek-A-Boo; Lift-the-Flap Book)
The Peek-A-Boo series was designed by child psychologist Fabien Savary to enhance child development in three ways: by broadening vocabulary, by developing fine motor skilss, and by introducing children to new and stimulating concepts.  Each book asks a number of very simple questions and, with Caillou, childern peek under the flaps or pull the sturdy pull-tabs to find the answers and have fun while learning.