Sketchbooks come in a wide variety of shapes and sizes, with varied covers, and differing numbers of pages. Sketchbooks began as a way to provide a readily available supply of drawing paper in the convenient form of a book. Finish of the work found in the sketchbook varies widely from artist to artist, with some having very simple drawings and lots of notes, and some having highly worked images. Over time, it might allow others to see the artist’s progress, as his/her style and skills develop. Many artists personalize their sketchbook by decorating the covers.