He is not often exhibited in Britain, which makes the Barbican's new exhibition very welcome. The Japanese architect Shigeru Ban has curated and designed the show, with a few works and sayings of his own inserted among those of Aalto. Ban, like Aalto, has a light touch and wants his designs to do good in the world. He is famous for, among other things, the cardboard shelters he designed for earthquake victims in Kobe.