In September 1939, France entered into war against Germany. Fín and Vilató were forced to go back to Spain. After several years of compulsory and punitive military service, Fín and Vilató met with their friend from the front Francesc Mèlich in Barcelona. Already working at a printing press, they persuaded Mèlich to open an engraving studio. This studio, where the brothers shared their passion for intaglio with other artists, became a point of reference in Barcelona, and it was there that Fín developed one of his signature series: Los Mathxullamas, a very rich personal universe with a name and cosmogony whose meaning was known only to him, as was also the case with the later El Fafarreo.