Several companies produce ready-made pieces for structural components (e.g., girders, beams), siding, furniture, figures (people), vehicles, trees, bushes, and other features that are found in the models. Features such as vehicles, people figurines, trees, streetlights, and others are called "scenery elements" and serve not only to beautify the model but also to help the observer obtain a correct feel of the scale and proportions represented by the model.