Expressionists turn blue, Gormley gardens and Rauschenberg reaches out – the week in art

In the Rain by Franz Marc, 1912. Photograph: Staedtische Galerie im Lenbachhaus und Kunstbau Muenchen/Lenbachhaus Munich

Exhibition of the week

Expressionists: Kandinsky, Münter and the Blue Rider
The passion and spirituality of a key movement in early 20th century German art jerks back to life like Dr Caligari’s creature.
• Tate Modern, London, from 25 April until 20 October