Final answer:
Barbara Kruger's principal aim is to expose the deceptiveness of media messages through her work that incorporates and critiques the design of contemporary advertising using themes of democracy, money, power, and belief.
Step-by-step explanation:
Barbara Kruger's principal aim in her artwork is to expose the deceptiveness of media messages. Kruger, who began her career as a graphic designer, utilizes her skills to create impactful, large-scale works that incorporate the slick design of contemporary advertising while challenging it. By using the persuasive language and visuals found in pop culture, Kruger's work often raises questions about democracy, money, power, and belief, as seen in her installation titled 'Belief+Doubt' which occupies the museum's lower level with an immersive array of text-printed vinyl. Her works, such as 'Untitled (Your body is a battleground)' engage directly with feminist critiques of the media and employ brief, assertive sentences that reflect the condensed communication style prevalent in advertising, thereby mimicking and critiquing how advertisements impact consumer beliefs and behaviors.