In art thi s is known as informal or unequal balance. If something is identical on both or all sides of the center, it has a formal balance. Sometimes things are balanced all about a center, and that is called radial balance. Fig 46.7 is example of symmetry building. Firmness means the construction must be stand, not fall.
Delight means the quality of the architecture related to art and music.
And the most important is co mmodity which means that the construction must fit the function. Fig 16.2 is an example that a building has to fit the function. The function of a building influences its form. This building is a garage for truck. So, the form of the door has to big enough for truck.