Nature Bundle contains four new worlds for Forest, the Macintosh relaxer. Remember, if you don t have Forest, you cannot use the Nature Bundle. The Nature Bundle plays soothing nature sounds. It contains Forest World II--a rainforest atmosphere, Garden World II--sort of like a park, Cicada World --a summery atmosphere and Wind World--very windy. Now you ll have more variety for your background sounds when using the Forest program. For more information, please read the documentation or visit the home page.