Roni Horn (b.1955) has been exploring the nature of water for over three decades. Her photographic work Still Water (The River Thames, for Example) (1999) seeks to capture the ‘perpetual wildness’ of London’s River Thames. As Horn once noted, ‘The Thames has this incredible moodiness, and that’s what the camera picks up.’ In this series – which also resides in Tate’s permanent collection – Horn seeks to understand the varying moods a river can evoke as one passes along. Numbered footnotes distributed across the image relate to eloquent and poetic responses by the artist to the water; that she describes as ‘reverie, evolving quickly into a manic, obsessive, endless flow of consciousness.’