Creating space in an image involves allowing the eye to roam freely and rest. Here you can see the foreground blending into the background with the use of colour and focus. The foreground appears warm with tertiary colours whilst the background has a cool blue cast .The blue hue is the way we naturally view the atmosphere . Think of a mountain range in the distance. It appears blue, so therefore this colour is the obvious choice for selection in order to create the illusion of depth in this image.