The principles of design are the fundamental parts of an artwork. Identifying these principals is one way to understand an artwork.
#2 - TEXTURE
Texture refers to the tactile qualities of a surface -- the way objects actually feel or the way they look like they would feel.
Sculptures, ceramics, mixed-media collages, fiber art, etc., may have bumpy or varied surfaces - actual textures you can feel. A painting, drawing, print, or other two-dimensional work can be made to look like a textured surface - implied texture.
Great example of line work in art:
Jan Van Eyck - Artist
Arnolfini Portrait, 1434
