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In an effort to promote Spain's image abroad, the first official exhibition of Joan Miró's was held in Barcelona in 1968 and supported by Francoist officials. The Architects' Association of Catalonia (COAC) organized a counter-exhibition in 1969. Miró had the idea of creating a long mural on the windows of the COAC building (in Cathedral Square), which already featured a mural by Pablo Picasso. Portabella asked to film not only the creation of the mural, but also its live deconstruction at the moment the exhibition closed. Miró was enthusiastic, and the result was this singular collaborative portrait.