A shape is a two-dimensional area that stands out due to its defined boundary or changes in color, texture, or value. There are two main types of shapes - organic/curvilinear shapes that are irregular and often asymmetrical, and geometric/rectilinear shapes that correspond to regular shapes like squares and circles. Shapes can also be classified as positive if they contain details within the outline or negative if they are just an outline without internal details. Shapes may also be symmetrical, where dividing the shape down the middle results in identical halves, or asymmetrical.
