Colorado based design studio Berger & Föhr practice cohesive visual communication characterized by modernism, minimalism and objectivity. Recently they launched Recher, world's first gesture based calculator.
Math is beautiful. Arithmetic is simple. Rechner is both.
Rechner has gestural functions for +, -, = and clear. There is a hidden actions drawer for x, ÷, ±, √, % and erase. I love the concept but I can imagine that it will take a while before one is used to the gestures.
Rechner is now available on the AppStore.