De lama lâmina (2004) is the video unfolding of the performance made in collaboration with musician Arto Lindsay during Carnival in Salvador back in 2004. Instead of the traditional trio elétrico (sound truck), a major tractor is used in the performance as a kind of carro alegórico (allegorical float) and followed by the bloco (Carnival group) Cortejo Afro. Between the wheels of the machine is the Greenman, a hybrid figure, half man, half plant, while outside a character inspired by an ecologic activist climbs the huge tree carried by the vehicle.
Interested in the relationship between apparently opposed elements, Matthew Barney approaches here, among other issues, the link between creation and destruction both in the ecological and sociopolitical realms. The title is a reference to two Candomblé deities: Ossanha, the orisha of plants and the vital forces of nature, and Ogum, the orisha of iron and war.