What is the fundamental characteristic that identifies a shape in design?

The primary identifying characteristic of a shape in design is its form. Form refers to the overall structure, configuration, and outline of an object, which plays a crucial role in how that object is perceived visually and conceptually. Form encompasses various attributes such as shape, volume, and spatial relationships, which are fundamental to understanding the design's aesthetic and functional qualities.

While the area it occupies is an important aspect of design, it does not solely define the shape itself. Similarly, the presence of the shape in three dimensions contributes to its experience and perception, but again, it is not the sole characteristic that identifies the shape. Textures applied to a shape can alter its visual and tactile qualities, but they do not define the shape’s inherent identity. Thus, the form remains the most essential factor in characterizing a shape in design.