A line is a mark with length and direction. It is an element of art which refers to the continuous mark made on some surface by a moving point. Types of line include: vertical, horizontal, diagonal, straight or ruled, curved, bent, angular, thin, thick or wide, interrupted, dotted, dashed, broken, blurred or fuzzy, controlled, freehand, parallel, hatching, meandering and spiraling. A line often defines a space, and may create an outline or contour. A line can also define a silhouette, create patterns or movement, and the illusion of mass or volume. A line can also be two-dimensional (as with pencil on paper), three-dimensional (as with wire) or implied (as the edge of a shape or form).