Highlighting various historic moments, proactive interventions within the realm of audiovisual media are analyzed in this thesis. Its goal is to discover, comprehend and compare the impact of such interventions not only as social agitators but also as contributory factors to sustainable development.
 	The following practices are emphasized: first approaches to the television set as an object at the end of the 1950s, various facets of video in the counterculture between 1960 and 1990, the pirate TV movement and strategic interventions into the mass media world, which were especially strong from around the 1990s onwards. Finally, the focus will be on the more recent developments of the many audiovisual community networks in their different social and technical surroundings. 
 	Simultaneously, these practices are influenced by the semantic ambit that television as a medium has acquired as of the mid-1970s. We refer to that ambit using the concept televisionTM. Its influence is a central guide within the historical timeframe of this thesis. 
 	From the 1950s until now we can find various practices, methods, attitudes and characteristics within the fabric of social relations, which relate to the proactive audiovisual practices and which reflect constant and variable factors within the entire period.
 	The analysis culminates in the field of artistic and cultural action, which intervenes as "media ecology" in our collective imagination, in other words, our mental environment.