What is a picture? What is the reality it represents? What is the message that such representation tries to convey? Films, photographs and other documentary materials represent reality. This means that reality is transformed because the creator chooses what to register and leave out the other parts of that reality. This choice depends on the idea that the creator has on the situation and the message you want to convey. In our quest to ensure that children understand these abstract concepts and to encourage a critical attitude towards the messages of mass media, we have developed a method we call NIMECO (Children, media and knowledge ). This method allows a practical and theoretical work with film, television and video. Paulo Freire says in the preface: "This understanding of cognition is what you can remove the risk of alienation and bureaucratization of the mind, allowing the man to conquer a position to be in control over the world. And this is crucial to rebel against oppression. I think this is the understanding of the act of knowing that "soak" method of work of Ana and Jorge Pozo Graviz. "