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The union of lines allows the creation of textures. All things or objects have a specific texture. If you close your eyes you might even know that they are some of the objects just by touching them.

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Line quality is also called line weight and simply put, refers to the thickness or thinness of the line.  Lines may become wider or thicker in areas where the object itself is thicker.  Or lines may become thicker to help indicate a light source.  Lines in areas of shadow may be thicker.  By varying line quality (weight) you add variety to your work.  Take a look at the apples below.  Notice how varying the line quality in the drawing on the right, makes the apple appear to have form.

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https://www.youtube.com/watch?v=V4xigwYwrIU

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The visual information of a line changes according to the characteristics of the stroke, its thickness and saturation depending on the tool, surface and pressure applied or the type of lines that predominate in the composition and organization of a work of art.
Vertical, horizontal, diagonal, curve, and Zig-Zag.

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A line is a succession of points or, what is the same, a point in movement. In addition to being an instrument with which to delimit forms and describe contours, the lines can be used as an expressive resource when they are known to exploit their nuances and associations. Hence it is often referred to as one of the basic structural elements of art.

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The line is a continuous longitudinal sequence of points. Lines in art may be visible, such as those drawn, or suggested. The suggested lines are those that are not in the work in an explicit material way, but their direction is perceived in the set. The line is part of the seven basic elements of visual art, which are color, form, line, shape, space, texture, and value. Those elements of art are the building blocks used by artists to create a work of art.

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Students will be introduced to one of the basic elements of art—line—by analyzing types of lines used in various works of art to help students understand how artists use line to convey movement and mood. They will then create an abstract line art piece based on an activity they enjoy to do or watch.
1. Students will be able to create a basic contour drawing using artful lines.
2. Students will be able to identify and properly use various drawing materials.
3. Understand the use of lines.
4. Be able to identify different characteristics of line.