The Apple company attaches great importance to the small details of its programs, and in the case of iOS and OS X we are talking about a special attention that the engineers from Cupertino have when creating the interfaces used by hundreds of millions of people around the world. Starting with iOS 7 the Apple company has implemented for us a Control Center which, among other things, has available a button that allows the use of the LED flash of the terminals as a flashlight, this one having a dedicated icon whose background changes when pressed.
What you probably haven't noticed yet is the fact that that flashlight also has a button in its center, this being positioned at the bottom of the housing or when the LED flash is closed and at the top of the housing when the LED flash is on. The detail is minor and hard to notice, but it reveals how much attention Apple really pays to such functions.
