Also called a rendering, an architectural drawing is used to illustrate a building or portion of a building. These renderings can be done by hand or using computer software, and can represent different visual perspectives by showing buildings or a portion of a building straight on (e.g., elevation drawing), from above (e.g., plan drawing), etc. Architectural drawings can appear in a variety of forms, from watercolor over a flat structure drawn in pencil to three-dimensional scenes of photorealistic images.