Gravity Clock App

This app by Joerg Piringer visualizes the passage of time by the permanent destruction and reconstruction of the clock-face.
In analog mode, each second, the hand breaks a number out of the dial and lets it drop to the floor where it gets buried by the following numbers and eventually withers away to make room for the endless succession of time. The digital mode is not dissimilar. There is also an alarm facility, a levitate mode reverses gravity, a night mode reduces brightness and the colour of the second hand can be changed by tapping the centre of the clock.

You can watch a video of it at http://joerg.piringer.net/gravityclock