The answer is d. negative.
Explanation for each option:
a. Geometric: Geometric shapes are precise and regular, such as circles, squares, and triangles. While geometric shapes can be used in art, they are not specifically related to the concept of contrasting positive and negative shapes in the context of the "Obey" campaign.
b. Organic: Organic shapes are irregular and often resemble shapes found in nature, such as leaves, flowers, and animals. Like geometric shapes, organic shapes are not specifically related to the concept of contrasting positive and negative shapes in the context of the "Obey" campaign.
c. Implied: Implied shapes are created by the perception of shapes where none actually exist, often through the use of lines, edges, or colors. While implied shapes can be a powerful tool in art, they are not the primary focus in the context of the "Obey" campaign.
d. Negative: Negative shapes refer to the space around and between the subjects of an image. In the "Obey" campaign, the artist, Shepard Fairey, used contrasting positive (the subject) and negative (the background) shapes to create a striking visual impact. This technique helps to emphasize the subject and create a strong visual message.
e. Positive: Positive shapes refer to the main subjects of an image. While positive shapes are important in the "Obey" campaign, the question specifically asks about the use of contrasting positive and negative shapes, making "negative" the more relevant answer.
Therefore, the correct answer is d. negative.