This chapter stages a dialogue between postcolonial theory and contemporary relational ontologies over the question of epistemological and ontological violence. It engages this performance via postcolonial theory and feminist STS based engagements with the nature-culture boundary, including Aimé and Suzanne Césaire, Isabelle Stengers, Donna Haraway, Edouard Glissant and Helen Verran. The concepts of ‘cosmopolitics’ and ‘imaginaries’ are used as meeting grounds and experiments towards a form of ‘anti-colonial materialism’. In particular, this chapter foregrounds attention to different positionalities along the coloniser/colonised divide, and the implications for speaking from different positions. Geopoesis, the cosmic, the colonial, and the human come together across these inter-war dialogue to question how the reproduction of violence is inter-linked in imaginaries of matter.