Shapes, points and corners are all features. Features can be classified as being large or small. Consider the simple design shown in Figure 1. It consists of features which are both large and small.

Figure 1. A simple design, consisting of small and large features

In Figure 2 the large features of the design have been isolated. See how the overall structure of the design is still apparent. This demonstrates how the large features of a design `carry' its composition.

Figure 2. The large features of Figure 1 isolated

In Figure 3, the small features of the design have been isolated. See how little it resembles the original design. This is typical of most drawings, their small features being structured differently to its large features.

Figure 3. The small features of Figure 1 isolated

Just for ease of comparison, in Figure 4 is the original, the large features and the small features next to each other.

Figure 4. A design compared to its small and large features

Another name for small features is details. A typical design process first defines the large features, then the details... details come last!