Line
To draw complex shapes in 
perspective, they must first be drawn in a cube or "bounding box" that is drawn to conform to the type of perspective being used. It is usually necessary to find the centers of the faces of the bounding box to serve as reference points for drawing the complex shape. The center is located by drawing diagonal lines through the corners of the face to create an "X". This technique, with slight variations, can be used to draw most geometric shapes such as circles, cylinders, pyramids and cones.