Natural philosopher and utilitarian William Paley is best known for comparing the world to a watch which design is self evident of a creator. In Natural Theology Paley uses examples from biology, anatomy and astronomy to demonstrate the complexity of the design. With such intricacy in the design there can only be the conclusion that it was designed by a wise deity. Being Paley's last book he suggested reading it first for it provides a systematic understanding of his arguments that he uses in his other works.