In Auckland last week, Japanese architect Shigeru Ban gave a talk to a capacity crowd in the Auckland Town Hall. Ban is best-known for his work using cardboard tubes as a building material in everything from refugee shelters to glamorous Expo pavilions, but one of my favourite pieces he showed was his 'Curtain Wall house' in Tokyo, which replaces the architectural version of a curtain wall with, quite literally, curtains. It's witty but also extremely beautiful.

Currently under construction: the much weirder outpost of the Pompidou Centre in Metz, France, scheduled for completion later this year.