When Wang Hanzheng, a Chinese student at the Royal College of Art, attended a graduate show in a warehouse on Brick Lane in east London in July, he found the space crowded, unimaginative and unfit for presenting art. It was with this in mind that at 11pm one night earlier this month Wang and a team of 22 others painted a Chinese political slogan in bold red characters along a nearby wall stretching nearly 100 metres. The artwork – which spelled out the Chinese government’s “socialist core values”, including the…