Line, value, shape, form, space, color, and texture are elements of art. Line is a mark with greater length than width that can be horizontal, vertical, diagonal, straight, curved, thick, or thin. Value refers to the lightness or darkness of a surface. Shape is a closed line that can be geometric or organic. Forms are three-dimensional shapes that express length, width, and depth. Space is the area between and around objects, and can refer to both physical and optical depth. Color has characteristics of hue, value, and intensity, and is created through mixing primary, secondary, and intermediate colors. Texture is the surface quality that can be seen and felt.