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…).
Design Elements
Additive/Subtractive
Subtractive
The roof cutouts are forms that are subtracted from the main. They create space without altering the shape of the home when viewed from the front or back. Quillin Residence
Additive
The U shape of the Richardson Residence is comprised of two almost independent elements rotated around a third, a tower. Each piece is nearly symmetrical about itself, but together the composition is organic. The roof deck on the right is composed of both an additive and a subtractive element.
Subtractive
The Patriots Peace Memorial uses the subtractive approach literally. When a new name is added to the memorial, a brick is removed and replaced with a glass plaque. The memorial grows lighter and more open over time.
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©2016 DAVID D QUILLIN ARCHITECTURE
