Final answer:
The basis of a complementary color scheme is that colors opposite each other on the color wheel are considered complementary. Complementary colors create a visual tension and suggest energy and action. Blue and orange are examples of complementary colors.
Step-by-step explanation:
The basis of a complementary color scheme is that colors opposite each other on the color wheel are considered complementary. When complementary colors are placed near each other, they create a visual tension or suggest energy and action. Complementary colors are often used when a dramatic effect is needed with only two colors. For example, blue and orange are complementary colors.