Final answer:
In stock footage depicting messages on signs, the most likely purpose of the messages is political activism. Artists also use posters, graphic design, expressive behavior, and symbols to communicate political or social messages effectively.
Step-by-step explanation:
In stock footage depicting messages on signs, the most likely purpose of the messages is Political activism. Political activists often use signs to convey their messages and promote their causes. Signs can be a powerful and visible form of protest or advocacy, attracting attention and spreading awareness.
Other art forms that artists use to communicate political or social messages include posters, graphic design, expressive behavior, and symbols. For example, political posters have been used throughout history to influence public opinion and mobilize the masses. Graphic designers use symbols and logos to create impactful visual representations of messages. Expressive behavior, such as the choice of attire by political candidates, can also send messages to the public.
These methods are effective because they use visual communication to capture attention and convey messages in a concise and powerful way. They can elicit emotional responses and spark conversations, making them valuable tools for communicating political or social ideas.