Apple introduced type of a 3D parallax effect which also brought in tonnes of problems... 1.wallpapers zoom a lot. 2 Brings a shadow on the lock screen where the time is shown when reduced motion is turned off. 3. It controls all the animations.. If reduced motion is switched on, the animations stop working(only in 7.1 beta) (eg. Weather animations) 4. We can't set any wallpapers which is not the size of the screen ..(workaround - take a screen shot and then keep it as a wallpaper) 5. The parallax effect is only good on some wallpapers, if u have a gradient wallpaper, it's of no use.. With iOS 7.1 they have tried to give a solution .. they have got an option of motion on and off when we set up a wallpaper which turns off parallax and keeps the animations.. But if this parallax is just removed from the phone , all the problems will be solved in second .. These are just my thoughts about it..