Art changed in the 1980s. It became the sole preserve of leftist Trotskyites who hated Thatcher. People who had to work, worked. Those who could afford the luxury of time to protest complained about those who worked and the economic benefits they generated. But now things are changing as artists such as Moonman 158 are showing that the really orthodoxy is now the blob groupthink on issues such as climate, and they are prepared to challenge that orthodoxy in the only way they now how - graffiti.