Tactus Technology

   Imagine your phone.  Imagine buttons appearing virtually out of nowhere when you need to message someone.  You have just imagined Tactus Technology.  And it's not a dream. It's a new technology that uses and overlay screen on top of your regular screen and a special fluid.  When activated the fluid actually creates buttons that as you type you can feel.  Just like if buttons were a feature on your phone (like a Blackberry).  In the article "This Insane Technology That Makes Buttons Appear On A Flat Smartphone Screen Is Pretty Close To Magic" De'Onfro describes this technology; "Tactus has created a thin layer that can replace the Gorilla Glass on top of the touch sensor and display layers of a smartphone or tablet. The surface of that layer is a semi-elastic polymer under which there are little channels filled with a special transparent micro-fluid. To make buttons appear (for a keyboard, a game controller, whatever), you can increase the fluid pressure in a certain area. The added fluid physically stretches and raises the polymer surface.  Presto! Real buttons on your previously flat screen."  When you are done with the application the buttons disappear until needed again.   Pretty cool!  See the pictures and video below for this amazing technology.

article cited http://www.businessinsider.com/tactus-technology-tactile-touchscreen-2014-1