For years children who have found every single thing in every single I Spy book have begged for a harder book to challenge their visual and mental skills. Consequently, Walter Wick and Jean Marzollo selected from previous I Spy books the hardest pictures - the ones with the most objects. Jean Marzollo then asked children in second and third grade to tell her which objects were the most difficult to find. With their comments and eager spirit in mind, she wrote brand new rhyming riddles. Warning to grown-ups: if this book is too hard for you, enlist some children to help.