He said that nature seems to have order and purpose to it. He noted that natural bodies act in a regular fashion to accomplish an end. He also adds that nothing inanimate is purposeful without a guiding hand. He states that there is order and purpose in the world, but adds that inanimate objects (such as planets) could not have ordered themselves, as they do not have any intelligence in which they could makes plans or patterns. He then concludes that therefore they must have been given an order by an intelligent being, or God. This is Design Qua Regularity. A modern example of Aquinas' theory is that of non-rational beings acting in a specific way that leads to the best results. The annual migration of vast pods of grey whales from subarctic feeding grounds just off the Alaskan coast to their Mexican feeding grounds, a journey of 20,000km that can take over 3 months. These behavior patterns rarely change, and the end result is beneficial so there must be a purpose to them. They achieve the end result not fortuitously but designedly. .
William Paley put forward the most famous design argument in his book Natural Theology. It discusses many different examples of the suitability of bodily structures of animals to the conditions of their life. This is an example of Design Qua Purpose. In his book, Paley discusses many different examples of the suitability of the bodily structures of animals to the conditions of their life. He argued that everything is clearly designed and it is designed for a purpose, designed to an infinite degree of care, pointing to an intelligent designer, God, 'The hinges in the wings of an earwig, and the joints of its antennae, are as highly wrought, as if the Creator had nothing else to finish'. Examples of this are found all over in nature. The eye, how it is perfectly adapted for sight. The Lacteal system, its number and positioning of teats in proportion to the number of young it bears.