The design-drawing process begins with two-dimensional expressions in the form of orthographic sketches and drawings.
These multiview drawings are which help us accurately examine geometric configurations, spatial relationships, and the scale and proportion of a design. However, by themselves cannot reveal the three-dimensional pictorial configuration of an object, according to orthographic projection theory. For pictorial depth expression, the closely related three-dimensional, are characterised by ‘paralines’ and ‘perspectives’ are needed.
Paralines as the name implies, are characterised by parallel lines, whereas perspectives are characterized by converging lines. Paraline drawings depict volumetric forms by combining the parameters of length, width, while simultaneously uniting plan, elevation, and section into one illustration.
Perspective drawings seen from a fixed vantage point create the most realistic, lifelike views of the built environment and the urban landscape.