Shadows define the shape and without shadows, there would be no impact.

 Shadows provide depth to an otherwise two dimensional art form.

  One cactus is used to frame the others in the background.

The soft turn of a single paintbrush leaf is brought out with macro equipment.

 Looking for mirrored objects bring out the pattern and shape of Adam and Eve
formation in Arches NP.

The rail of a porch is nothing but a study in patterns.

 Patterns and texture often work together in this shot of old fishing gear

Fog helps isolate a subject from its surroundings.

 Using selective light is a good technique to isolate a subject.

 Contrast in color to isolate a flower.