Espiral negra: concretude in the Atlantic -- Jose MartÃ's material traces -- The writing on the walls: Babylon, Wall Street, Canudos -- Ramiro de Maeztu's Primacy of things -- The spirit of Martà in the land of Coaybay -- Object, non-object, transobject, relational object: from concrete poetry to a nova objetividade -- Epilogue: hacia post-concretude