Ai Weiwei: ‘An artist must be an activist’

The Chinese artist answers questions from Observer readers and art world luminaries on creativity and protest, Chinese politics – and why he never cooks the same dish twice

Fashion firms apologise for implying Taiwan and Hong Kong separate from China

Coach and Givenchy among brands criticised on Chinese social media as Hong Kong protests fan nationalism

Rankin’s best photograph: a supermodel in a cow mask

‘I didn’t think models were being treated as people. So we borrowed a farm, put some in masks – and shot them in a cow barn then a pigsty’

Woke models: how activism became fashion’s latest must-have

It’s no longer enough to have a look. Adwoa Aboah and Leomie Anderson’s socially aware voices have made them the stars of the new catwalk generation

How to change the world: Greenpeace and the power of the mindbomb

The director and key figures in an award-winning documentary talk about the early days of the activist group and how shocking images were used for global impact

Ibiza unites against oil prospectors

The waters surrounding the Balearic party island are a world heritage site – and conservationists, politicians and tourist chiefs are adamant that plans to drill in the sea must be stopped