Counter-Information: Video-Nou / Servei de Vídeo Comunitari

In a 1977 photograph, a crowd presses up to the windows of a bus fitted with TV monitors. That was Video-Nou's screen: young sociologists, architects and teachers who filmed strikes, marches and neighbourhood meetings, then played the tapes back to the people in them.

There are 30 videos, 17 newly digitised and unseen since the late 1970s, and nearly 300 photographs and documents, in four sections: counter-media, video in schools, dissidence, and neglected neighbourhoods. You can watch a CNT petrol-station strike, Canet Rock 1977, Barcelona's first Carnival since 1937, and Ocaña lip-syncing Lili Marlene on the day of a 1977 gay and lesbian march. Film the street, show it back to the street, argue about it: your building's WhatsApp group runs on the same method.

It's an archive show, so come to read and watch. It's on Floor 1 of the Meier Building, on the general MACBA ticket (valid for a month), with a free curator-narrated Digital Guide and free tours on Sundays at 11am until 8 November.