This page contains an ActiveX Animation that your browser was unable to view. Click here to open pres0.ppz fullscreen. To a certain extent, artists became prisoners of the perspective system which they had helped to create. However, if artists use perspective as an aid rather than an end in itself, it can be very useful.
Many fine artworks ignore perspective or show faults in the use of the perspective system.
Perspective systems should be learned by artists so that it is available to them. Artists like M. C. Escher visually subverted our view of the three-dimensional world. He drew the front and back of this building simultaneously. M. C. Escher, Belvedere, 1958.