Publication of the exhibition project 'Macla, mamua, bismuto, vicario', which is celebrated at the Jorge Oteiza Museum from July 27, 2018 to January 20, 2019. The starting point of this project is the idea of 'macla' (double), associated with the series of works so titled by Oteiza, based on the merger or encounter of two or more volumes and activated by the relationship between their parts. That is why the book presents a series of 'confrontations' between images, through transparencies in b/n, which generate new forms and meanings. Descriptive video: https://vimeo.com/282990421