The volume slider on the iPhone lock screen has a reflection, animation

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iPhone volume slider polish animated
If you double tap the home button while your iPhone is off, it brings up the music controls – this is nothing new. However, in iOS 6.1, Apple updated the style of the controls and particularly on the volume slider. If you rotate your iPhone left and right, you will see the reflection on the volume knob shift appropriately.

[thanks Daniel Samuels!]