The document discusses the key elements of interior design: line, space, shape, form, texture, and color. It provides examples and definitions for each element. Line can be used to create movement, harmony, and set form and shape. Space can be positive (filled) or negative (empty). Shape is defined by its dimensions while form includes depth. Texture can be tactile or visual. Color is influenced by hue, value, and intensity and can be organized by primary, secondary, tertiary, complementary, or monochromatic schemes.