
In London's Trafalgar Square, there are three plinths holding royal statuary. There was a fourth built in 1841 by Sir Charles Barry, and meant to display an equestrian monument of William IV. There were insufficient funds however, and the statue was never completed. To this day, Londonders have grown used to the empty platform, which has never been filled because no agreement could ever be settled on which king, queen or hero to feature there.
In the summer of 1999 there was an art project opened to the public in which ultimately, three winning sculptural installations each had their own time on top of the plinth. This summer, installations of a different kind have been awarded. Between July and October, 2400 Brits will be (or have been) awarded one hour each atop the plinth to speak, shout, sing, demonstrate, dance, protest. The website offers a live webcam performance on whose turn it is right now. (As I write this, "Paula C." from North-West London is quoting the songs of The Smiths and Simply Red.)
The ongoing performance continues as you read this.
http://www.oneandother.co.uk/
http://www.london.gov.uk/fourthplinth