The home screen of a smartphone can be a place of subtle, animated beauty, as active wallpapers flow moving imagery behind app icons, or the icons themselves move, shifting slightly as you pivot an iPhone, creating a 3D-like parallax effect that make them appear to hover above the screen. They're swell tricks that nibble away at battery life. You won't notice a huge bump from choosing a non-active wallpaper, and/or switching off parallax, but battery discipline doesn't get much more painless than this.
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