The Glass Tank by Japanese designer Kouichi Okamoto of Kyouei design. It looks remarkable and works with water and air pressure. You don't concern the liquid will fall from the glass. When emptying the glass, the tank re-fills it with a constant amount of liquid, without flowing over the brim.
It is a glass for drinking a lot. A device made of a bulb shaped container with the glass below. When the amount in the glass decreases, a constant amount is transfer from the tank into the glass. Never spilling over from the glass because of water pressure and air pressure.