Save battery . Save lives. In the poem (in the previous page) the battery is a metaphor for our life or if taken simply just our energy. I meant to say that we often waste our energy on trying to look like something or trying to attract ( live wallpapers) . But sometimes its better to keep it quite and calm and save battery (plain wallpaper) . And ovio the black has its own significance.
Wallpapers kept getting livelier through the years,