Tactus Technology has shown off some impressive technology, a morphing touchscreen which creates physical buttons from your buttonless touchscreen. Tactus' technology works by providing "application-controlled, completely transparent physical buttons that rise up from the touch-screen surface on demand."
When the buttons are enabled, they pop up onto the screen, when disabled they recede back into the screen, leaving your once smooth and flat touchscreen back in its original state. Tactus enables the Tactile Layer, which is called microfluidics. These microfluidics are small channels that are routed throughout the Tactile Layer, allowing fluid to expand the top polymer layer, which creates physical buttons.
It sounds impressive, but it'll be more impressive once we see Tactus' technology built into the devices we know and love, and use.