The self-management experience of the workers of the Numax factory in Barcelona (Spain), at the end of the seventies, was included in a documentary that they themselves decided to entrust to the filmmaker Joaquim Jordà at the moment when the factory were about to close. It was titled "Numax presents..." (1980). Those images, recovered, together with the situation in which those same workers are so many years later, lead us to reflect on the last and intense decades that have been lived in Spain, to discover the fragility of youth ideals and offer a history of the political transition from dictatorship to democracy.