This wallpaper has 3D snow scene that is rarely seen in any other wallpaper. You can also set to simulate sunrise and sundown. You can set the color of morning, noon, dusk and midnight. You can also set the color of the flash light of the plane flying in the sky. There are gradual change, blue, red, pink and orange for the background change. There is also sky full of stars as background. You can set the sky show colors as time passing by, or you can simulate its change.