The ethnographic documentary has been one of the ways of recording and showing the diverse Afro-Mexican dances of the Costa Chica, the article argues that this audiovisual genre can also be used as a way of investigating dance memory. The text makes a first analysis of the documentaries produced on the dances of this region and presents part of the process of making the documentary feature film El Quizá, donde la memoria danza, directed by the author, whose primary interest is to contribute to the collective memories of a people.

BAsado in the documentary Over the Wall / Sobre el muro (El Colef, 2019), this text discusses some social effects from the transformations of the barriers and divisions that have demarcated the border of the states of California, the United States and Baja California, Mexico, until the construction of fences and border walls promoted by the last four US federal administrations. Based on interviews with specialists in migration and borders, residents, and an investigation of archives and documents around the wall and its effects on the Tijuana-San Diego border, this documentary captures periods of change and border reinforcement by States. States, as well as the recent situation with the arrival of new migratory flows such as the caravans of Central American migrants to Tijuana and the challenges for this border.