Color theory influences artwork in several ways:

1. Mood: Warm colors (reds, oranges) can create energy, while cool colors (blues, greens) can be calming
2. Contrast: Complementary colors (opposite on the color wheel) create visual interest
3. Harmony: Analogous colors (next to each other on the color wheel) create cohesive palettes
4. Depth: Warm colors appear to advance, cool colors recede, creating depth in paintings
5. Emphasis: Bold or contrasting colors draw attention to focal points in the composition

Color categories in the color wheel:

1. Primary colors: Red, blue, and yellow (cannot be created by mixing other colors)
2. Secondary colors: Green (blue + yellow), purple (red + blue), and orange (red + yellow)
3. Tertiary colors: Yellow-green, blue-green, blue-purple, red-purple, red-orange, and yellow-orange (mixtures of primary and secondary colors)
4. These colors form the basis of color mixing and harmony in art and design

Color psychology in art:

1. Red: Associated with passion, energy, and excitement; used to create focal points
2. Blue: Evokes calmness and trust; often used in corporate designs
3. Yellow: Represents happiness and optimism; can be used to attract attention
4. Green: Symbolizes nature and growth; used to create a sense of balance
5. Purple: Associated with luxury and creativity; often used in beauty products
6. Artists and designers use color psychology to evoke specific emotions or reactions in viewers