The use of perspective opens up a work and draws the viewer into it. Math was first used to devise perspective in Florence during the 15th century. In this 30-minute film from 1997, you will see where Piero della Francesca devised his use of perspective. Two artists travel with the viewer to Florence and discuss how perspective was calculated and how it worked in art. They trace just how it was used over time and how artists during the early 20th century began to rebel against it to create new artistic expressions. With the use of a computer to show the reader how perspective can be planned for a painting, the viewer is shown just how exacting it can be. To show the opposite method, one of the artists us shown challenging perspective rules as he creates a work of his own.