Negative shapes

A mold is a form containing a hollow, negative shape. 

When Is Shape Not a Shape Positive and Negative Shapes... 

Students will identify positive and negative shapes in two- and three-dimensional works of art (macrosculptures) and in unbranched, branched, and cyclic hydrocarbon molecules (microsculptures). 

Point out positive and negative shapes in the examples and answer the following questions ... 

Observe the arrangement of the positive shapes and negative shapes. 

If the feed motion of a shape-generating counterpart in axial direction is parallel to the ultrasonic vibration, the process is called conventional face die-sinking. The process can be used purely for drilling or for the generation of profiles in the workpiece. In this case, a profiled shape-generating counterpart is used, whose negative shape is projected onto the workpiece (Figure 17.4a). 

The Cut Away technique (see page 58) used here, creates curious negative" shapes, such as the arrowhead in the heart. The zig-zag step in the shaft of the arrow must be minimized to reduce the stepping effect, but if the creases it forms are too short, the construction may rip. Use thin card (cardboard). This card is decorated using pastels broken to a powder and rubbed onto a marble-effect card. 

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