As publicity for the exhibit Miró L'altre, organized by the Colegio de Arquitectos de Catalunya in 1969, the Board commissioned Pere Portabella to film Miró painting the "poster" for the exhibit on the ground floor windows of the building. Portabella was not interested in simply filming a testimonial documentary. However, he said he would do the film if after the exhibit Joan Miró himself, with the help of the cleaning staff erased his own painting. Joan Miró accepted the idea without a doubt. The complicity between the film maker and the painter is evident in the filming.