This is the second in a series of interactive bubble books. In O2 two bubbles float across oceans, through a desert, and over the moon. They meet a zebra, pink flamingos, kookaburras and more during their colorful journey. With the touch of a finger the bubble lifts off floating onto new adventures. With the opening of a page or a touch sounds make the beautiful pictures come alive. Young children will delight in the floating bubble, the sounds and the brilliant colors.