Gravity Clock for Mac - Watching the Time Pass Posted 3/14/2016 at 20:32 UTC in Mac by gnye@amdesign.net | Permalink | Tweet Independent developer, Jorg Piringer today announces Gravity Clock for Mac 3.0. Gravity Clock combines a physics simulator with a minimalist clock design to create the 21st century successor of an hour glass. It not only shows the current time but also visualizes the passage of time in a tangible way by the permanent destruction and reconstruction of the clock face. Every second the hand breaks numbers out of the dial and lets them drop to the floor.