Spiritual visions, robot stags and Auerbach through a glass darkly – the week in art

Hilma af Klint and Piet Mondrian unite, Mat Collishaw dives into the digital and a modern master considers himself in his 90s – all in your weekly dispatch

Hilma af Klint and Piet Mondrian
Two pioneers of abstract art who were both separately inspired by spiritual visions to paint the invisible.
• Tate Modern, London, until 3 September.

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