Drawing is visual art that makes use of any number of drawing instruments to mark onto a two-dimensional medium. Commonly used instruments include graphite pencils, pen & ink, inked brushes, wax color pencils, crayons, charcoal, chalk, pastels, markers, stylus. Drawing is defined as the marking of marks, lines, and shapes (some standard and non-standard), usually supported on, but not limited to various papers (an assortment of acid-free fine art drawing papers with a wide range of texture); although other materials such as cardboard, plastic, leather, canvas, and board, may be used.