Creating a freehand sketch is not necessarily just about trying to make an image of an object by simply drawing a set of lines. Without the ability to define the spaces that an object is contained in it becomes more difficult to create a clear representation of the the intended sketch without too much distortion of the intended image.

By simply breaking down the sketch into it's simplest shapes a greater degree of detail can be achieved wothout the need to make constant corrections in order to create a clear representation of the intended boject.

Two such methods of defining the space around the object are the Additive and Subtrative methods.

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