The Rule of Space is simply a technique that creates a sense of motion, activity or conclusion in your composition. It simply involves creating negative space that relates to your subject.
For example, if you place negative space outside your subjects head in a portrait, you imply maybe there is thought going on – particularly if you direct your subject’s eyes toward the negative space.
Or if you have a picture of a motorcycle zooming across the desert. Placing the negative space in front of the motorcycle creates a sense of direction or implication of eventual destination.
Watch the video on the Rule of Space