Tamasa, a project undertaken with Territorial Agency from 2017–18, took as its focus the sprawling urban zone of the River Thames and its estuary, material effects of which bloom deep into the North Sea. The zone is morphologically complex; large swathes are militarised; hosting the logistics industry, it is cut up, compartmentalised, closed off. Despite its being a frontier of England and the UK — now more so than ever — the estuary’s inhabitants are disconnected from the centres of decision-making upstream. But in naming each of its parts, and marking the material flux throughout it, the project began to address the estuary’s darkness, or ‘tamasa’ — Sanskrit for gloom, and possible root of the name Thames.