The billboard-sized LED screen on the wall of Damien Hirst’s Newport Street Gallery in south London is seen by thousands of passengers on trains heading in and out of Waterloo station every day. Commuters are currently enjoying an advert for Jeff Koons: Now (until 16 October), a solo show of the artist’s work drawn from Hirst’s huge collection, with the screen displaying details of Koons’s billboard-based work New Rooomy Toyota Family Camry (1983) and his railroad-themed sculpture Jim Beam-J.B. Turner Engine (1986). The images and colour scheme have been very carefully chosen, we understand, to avoid too much green or red, which could distract or confuse train drivers near one of the UK’s busiest stations.