Nokia World in 2021. The prototype Nokia Kinetic Device, including its display, can be flexed across both the vertical and horizontal planes -- with bending and twisting motions controlling the interface. If you bend the screen towards yourself, it acts as a selection function, or zooms in on any pictures you're viewing. In music mode, you can navigate, play and pause with the tactile interface. It's still a way off from arriving on phones, though Nokia is aiming to whet developers' appetites with this prototype. We may have seen some twisty interfaces already, but nothing packing a four-inch screen and built-in functionality like this. Nokia couldn't confirm the screen technology being used. Could that be a flexible AMOLED display? See those impressive viewing angles and contortions after the break and judge for yourself.