The Figure-Ground RelationshipThe gestalt principle that applies most to space is that of figure-ground. Everything in a design of yours will be seen as one or the other, and the relationship between them is mutually exclusive. Neither can be perceived except in relation to the other, and changing one is impossible without changing the other as well.
The figure-ground relationship is also complementary. Figure and ground can enhance or detract from each other, and organizing the two in relation to each other is one of the more important aspects of design. It sets a context for how your design communicates and how it will be interpreted.