Stuart Hall proposed that audiences must decode the messages that media encode in order to understand reality as constructed by media. Hall believed media have powerful influence over what the public sees as important issues. He identified three types of audience positioning. Laura Mulvey's male gaze theory suggests that media, like film and music videos, are represented from the perspective of a heterosexual male gaze. This can objectify and sexualize women through camera angles and framing. Andrew Goodwin's theory of music video analysis identifies six key aspects: demonstration of genre characteristics, relationship between lyrics and visuals, relationship between music and visuals, demands of record labels, and representation of characters and notion of looking.