This reading is about Building elements, which are elements that fill up the interior of a building in terms of definition, scale, proportion, and organization. There is  a certain amount of space required for horizontal and vertical pathways, and should contain certain qualities such as the form, space, light, color, texture, and pattern.  Each building must have a structural system, which is constructed differently depending on the weight of the building. With this, a building must include an enclosure system, which is practically the walls and roof of the building that shields it from the weather and certain exposures. Another element that should be included on a building is the mechanical system, which provides certain services that the people in the building could benefit from. this includes a water supply, waste disposal, transportation of heavy items and a massive amount of people, heating, and electrical systems.