Running the bath…
A bath behind your screen, the same shape as your screen. Tilt your phone and the water runs to the low side and stays there, ducks and all. Shake it and it sloshes. Level makes the way you hold it flat again. Tap the water to drop in a duck, drag a finger or mouse through it to make a current, lift a duck out and let it fall, poke one to hear it squeak, tap the soap for bubbles, or turn on the tap to make waves and push ducks under its stream. Drag in circles to build a whirlpool. Ducks and foam follow it, and it fades when you stop. Turn your phone round flat and the water swirls. No phone at hand? The arrow keys tilt the tub.