The Girl from Ipanema
Their first public work of art was a series of temporary installations, "Railings" (1996), first created in Paris and widely copied. In each case greyworld took a set of ordinary street railings and tuned them so that when you run a stick or an umbrella along them, rather than making the 'clack-clack-clack' sound as expected, they played "The Girl from Ipanema". Often created without permission, several instances of this installation have been removed.