This title includes four amazing I Spy readers bound together in one 6 x 9 paper over board format and features the picture riddles of Jean Marzollo and the stunning photography of Walter Wick! The I Spy Book Series is celebrating its 20th Anniversary in 2011. I Spy Books are published by SCHOLASTIC , a highly trusted brand among parents and educators worldwide. The I Spy Picture Books are very popular with kids and are based on rhyming riddles and finding/matching the corresponding images in the picture. The I Spy Books are fun, educational, activity-oriented, and help develop early learning skills (reading, visual discrimination, cognitive thinking, spatial relationships, hand to eye coordination, and interactive play).