Banksy piece has popped up overnight in Central London.Coming after several of his works popped up across London last summer, the piece contains familiar motifs for the elusive artist, and shows a girl in black and white clutching six gold balloons. It was found sprayed onto a boarded-up public toilet in Farringdon’s Clerkenwell Green.A report from The Metro notes a sign was placed next to the display, saying it was “forbidden” to remove or tamper with it.