At first retrospective in the UK of Ai Weiwei's work, at London's Lisson Gallery, the artist's "Surveillance Camera" is on display.

"I'm a little bit embarrassed about the tampons. When we unpacked that work I was like, 'oh no'," Tracey Emin on her retrospective.

Yayoi Kusama's eye-popping works are on view at the Museo Reina Sofía in Madrid.