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.... The term is common in mathematics and is often used as a basis for inter-disciplinary work.