This work entitled "Als mestres de Catalunya", which is composed of 8 lithographs by Antoni Tàpies on Guarro paper, published by Sala Gaspar in 1974, is a tribute to all the key figures of Catalan culture in which Tàpies claimed during the years of Franco's repression. It includes, through a great economy of elements, the different facets of knowledge. Science and Art join hands in a chromatic area that brings us closer to the Catalan geographical context. This work is more valid than ever and symbolizes the commitment of an author who, like Joan Miró, Joan Fontcuberta, Joan Brossa, Amèlia Riera, Vicenç Viaplana... have put their talent at the service of democracy and the vindication of rights fundamentals of Catalonia without making his compormís and his works a pamphlet but creations of a universal dimension with a bundle of values.