Debt clock

The National Debt Clock in New York (2009), an example for all other projects of that kind

A debt clock is a public counter, which displays the government debt (also known as public debt or national debt) of a public corporation, usually of a state, and which visualizes the progression through an update every second. Because of the mirror-image correlation between liabilities and accounts receivable meanwhile there are assets clocks or property clocks also, which visualize the private and state assets. Clocks to display the national interest charge are called interest clocks.

Debt clock of the German Taxpayers Federation shows its prognosis about the public debt of Germany.
Debt clock in Langenfeld, Germany