Lines have meaning and personality and can be used to create texture and organize spaces. Texture relates to the surface of an object and its look or feel, and using texture in design adds depth and visual interest even if the texture cannot be felt. Color is used to generate emotions, define importance, and create visual interest, with some colors like orange and red being warm and active while others like blue and purple are cool and passive. Harmonious colors are close together on the color wheel, while complementary colors are opposite each other.