Form can be created by adding shapes, or by starting with a mass and subtracting shapes. These two methods convey very different moods. Additive form can appear organic, as if it grew over time, and be more diverse. Subtractive form, by emphasizing the dominant shape, can be more formal, more harmonious, and more holistic. South Point Residence III, showing the addition of multiple simple gable-roofed forms together (the opening to the courtyard, however, illustrates subtractive design…).