The Prague Metronome is a 75-foot-tall functioning metronome in Letná Park, overlooking the Vltava River and the city center of Prague. The kinetic sculpture was erected in 1991, on the plinth left vacant by the late-1962 demolition of an enormous monument to former Soviet leader Joseph Stalin. The silent red metronome was designed by international artist Vratislav Novák, and officially named "Time Machine".