I visited Barcelona recently and was amazed by the highly original architecture of Antonio Gaudí. His buildings from late 19:th and early 20:th century were unlike anything people had seen before and he achieved this by exploiting the intersection of architectural design and the shapes he found in nature.
This method is very much alive today. For example, spectacular Burj Dubai, the tallest building the world that will be completed in 2008 has actually borrowed its shape from a local desert flower.
Some people like cities and skyscrapers and some don’t, but humans in general might feel more at ease if the urban world of steel, concrete and glass is designed with references to natural shapes and patterns. And flowers are pretty.