You know that little sleep indicator light on the front of your new MacBook Pro -- the one that simply disappears when your notebook is wide awake? Apple wants to do that for buttons, too. Cupertino's latest patent application is for pressure-sensitive, capacitive touchscreen materials it could build right into the surface of its aluminum-clad devices, and identify with laser-cut, micro-perforated holes that let light shine from within. According to the filing, the technology could potentially be used to eliminate existing buttons in favor of a smooth, solid slab, and / or integrate new ones into surfaces that weren't previously considered
