Color theory discusses how different color combinations work together based on concepts like color schemes, color wheels, and complementary/analogous colors. There are several types of color schemes including primary/secondary colors, complementary colors (across from each other on the wheel), analogous colors (next to each other), and monochromatic colors (one color plus tints and shades). Shape is also important, with organic shapes having curvy lines and geometric having straight lines. Balance can be symmetrical, asymmetrical, or radial. Asymmetrical balance means both sides are not identical. Positive space is the object area while negative space is around the object, and a good composition balances these spaces.