When considering art, it is critical that we take note of the materials used. An artist will often be very deliberate in choosing materials. Accordingly, it makes a great deal of difference whether a given work is in oil paint or pencil, or built up of melted-together pieces of steel. However, it is not enough merely to know that a particular material has been used. It is equally essential to know how the material was applied: the technique. Material and technique are inextricably linked. Material, after all, only becomes interesing to us when the artist does something with it.