When it comes to the look and feel of the OS, Android gives much more freedom to users as opposed to any other comparable smartphone operating system. You can theme, make changes through widgets, customize the boot animation, and pretty much change every aspect of the OS itself, all the way from the battery indicator to how the dock behaves (or even exists at all). In fact, the level of customization is so deep, that items like recovery and flashing of ZIP files through it have been given a proper, functional GUI as well (AROMA installer, for instance). The same freedom is also enjoyed by various manufacturers, who have, over time, developed a unique identity of their own through their distinctive Android UI skins. And the most popular one of them, by far, seems to be HTC’s Sense UI.