Symmetry is related to the idea of balance and refers to parts of a figure being the same as other parts. A typical example would be a perfectly proportioned face or a building that is exactly the same on either side of a central dividing lineLines are used by artists and designers to describe objects, add detail or create expression. Lines define an artwork and reveal the artist’s techniques. Line is one of the visual elements. It is the path of a moving point, such as a pen, pencil or brush. In your work, it is important to vary the quality of lines, making them bold and heavy or light and delicate to suggest different things. Line can be used to give the impression of different textures and tones as well as simply showing where the edge of an object meets space - remember that objects do not have outlines in real life.. The term is common in mathematics and is often used as a basis for inter-disciplinary work.