Since the lock button on my iPhone 5 is broken, I am reduced to using assistive touch to simulate one digitally. I was always impressed with the practicality and aesthetics of the UI, and it is apparently eye-catching as well, promoting rubbernecking and drawing "oohs" and "ahs" from onlookers. Perhaps in iOS 8 a similar mechanism could be used to navigate a nesting control center or settings menu?