Symmetrical artworks are those in which the entire work or certain elements within it include imagery that is reflected in a common axis. The current meaning of symmetry dates to the 17th century; earlier, since classical antiquity, the term symmetria meant, more broadly, the correctness of measure and proportion. The most common types of symmetry in art are bilateral and rotational, and the expression of human interest in symmetry is considered highly anthropomorphic as the typical human body is more-or-less bilaterally symmetrical. Symmetry in art is commonly used to express harmony and balance, as well as hierarchies—conveyed through the power of the central axis or an individual element’s position within a symmetrical system.