Thought Forms was a new collaborative site-specific participatory work located at Fort Darnet, a nineteenth-century military installation on a small island on the River Medway, Kent. The work, which transported audience members to the island by boat, was a development of Judd's recent large-scale participatory works.

The work was made in collaboration with choreographer Dionysios Tsaftaridis and composer Giannis Sfiris, as well as performers Surya Dev Chandra, Yutong “Arina” Yang, Jingsheng Gu, Adane Shikur, Angeliki Anargyrou and Marietta Sarri.

Thought Forms was commissioned by Estuary Festival and is part of a cycle which examines how a group might define themselves in relation to others, explored within the bounded space of a boat or an island. Thought Forms considered ideas around borders, belonging and sovereignty, reflecting on wider global contexts such as the rise of nationalism.

The work responded to folklore associated with the nearby Isle of Sheppey which suggests that until 653 CE the residents of the island thought they were alone in the wilderness, even though they could see mainland Britain from their own shoreline. They believed the nearby coastline to be a reflection, and that Sheppey was situated in a large mirror box. The folk tale concludes when a member of the community built a canoe and made the journey to the mainland at which point they realised they were not alone.

Within Thought Forms, the boat journey is considered as an alternative model of being together; as a vehicle for escape, transformation or change, enhanced by the dreamlike qualities of being on the water and of being suspended, or between worlds. The island is both a place to escape to and is somewhere on which we are marooned, it is both a destination and a point of departure. Within these contexts, the island suggests (and embodies) conflicting ideas of separateness and togetherness; an isolated utopian project where narratives can be invented, reused and recycled within a relatively closed society.