"Wheel" is an espresso machine with a 19 bar pump. turning the wheel a quater rotation, than open door and the box for nespresso-capsule move out and now you can put in an new nespresso-capsule. push the door and make a quater rotation from the wheel. the rest coffee dosen´t stand in the pipe will be that blow out with an overpressure. the water tank is a specila bottle from Vittel with Vittelwater. AND the best part? It's shaped like a C!