Back in 2020, the internationally acclaimed Chinese artist and activist Ai Weiwei bought a number of Chinese antiquities at an auction in Cambridge, a city in which he retains a base having lived here for a few years, and where his son still goes to school. Some of the pieces are more than a thousand years old, dating from the Northern Wei and Tang dynasties. In his new solo show at Cambridge’s Kettle’s Yard, he is showing them alongside his own new and existing work.