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The angle that these techniques are applied may remain constant within a drawing, or it may change in response to the angle and direction of the forms. For example, cross-hatching may flow around the surface of an object in a similar direction as cross contour lines. These techniques are also a great way to create the illusion of texture (see our article about observational drawings).
This wire drawing exercise ‘using line to create space’ is completed by students within a 3D Art class, working over photographic portraits. Having a base image to work from (this could also be an earlier observational drawing) makes the process of transferring from two-dimensional to three-dimensional much easier.
Wire Sculpture Line Drawing Exercise: This is an excellent activity for middle school students and for high school students, if it relates specifically to your project (and does not interfere with postage requirements, for those who need to post work away for assessment). Small wire experiments, using light-weight wire, can also be mounted to sketchbook pages.
A planar analysis drawing simplifies complex curved surfaces into flat planes, using straight lines. This process helps students to think about the underlying structure of objects and results in an analytical drawing, that is rather mechanical in appearance.