Texture is one of the elements of art that is used to represent how an object appears or feels to the touch or looks as it may feel if it were touched. Painters can convey the illusion of texture in a two-dimensional work of art to imply how an object or subject matter might feel if it was really touched. Examples of natural texture would be wood, sandpaper, canvas, rocks, glass, granite, metal, etc. Even the brush strokes used in a painting can create a textured surface that can be felt and seen. The building up of paint on the surface of a canvas or board to make actual texture is called impasto. There are four types of texture in art: actual, simulated, abstract, and invented texture.