Much of the art seen in museums were produced in the Middle Ages and the Renaissance. Both of these eras had prominent, overarching themes and techniques. In the Middle Ages, the main themes in art were religion (without iconography), Christian symbolism, the importance of recognition of sin, and the growing wealth and power of monasteries. They showed this through the use of primary colors in their paintings, symmetrical designs, gold backgrounds, and abstract art. Perspective was not developed at the time, and this was glaringly obvious in the art produced. This was very different from the Renaissance, when Greek and Roman culture was reintroduced to the public. Society began to focus on themselves rather than the spiritual aspects of life,