Joan Jonas, a pioneer of performance.

Hero to a generation of younger artists, Joan Jonas is a pioneer of performance and video who has pushed the boundaries of art for the last five decades.
Experience the largest exhibition of Jonas’s work ever held in the UK. Early works from the late 1960s are shown alongside recent installations dealing with topical themes such as climate change and extinction. You can see her landmark installations including Lines in the Sand, The Juniper Tree and Reanimation.

http://www.tate.org.uk/whats-on/tate-modern/exhibition/joan-jonas