The film was conmissioned by the Galeria Maeght to commemorate the Joan Miró exhibit organized by the French Minsitry of Cultural Affairs in the Grand Palais in Paris that opened on May 17, 1974. The film, that took five days to shoot, shows the smelting and casting process of the work known as Puertas Mallorquinas by Joan Miró. The filming team travelled to the foundry owned by the Parellada family in Llinars de Munt.
| Directing | Pere Portabella | Director |
| Writing | Pere Portabella | Writer |
| Camera | Manuel Esteban Marquilles | Director of Photography |
| Directing | Anne Settimó | Assistant Director |
| Sound | Anne Settimó | Sound |
| Camera | Pere Joan Ventura | Assistant Camera |