Sèvres Vase Clock
The Sèvres Vase Clock, a prototype by Georgios Maridakis, indicates the hour with an audible knock. Just place the vase of your choice on the brass and wood stand and the hammer will strike the vase each hour.
Each vase makes a different sound, but adding different amounts of water for different pitches and notes takes it one step further. The modern take on a grandfather clock is a subtle, unobtrusive way to indicate time—we'd add a few flowers too.