Wabi-Sabi - a Japanese aesthetic of things imperfect, impermanent, and incomplete.

Wabi-Sabi: The Art Of Imperfection
http://www.utne.com/mind-and-body/wabi-sabi.aspx?PageId=1#ArticleContent

The Beauty of Wabi-Sabi
http://www.globalonenessproject.org/library/articles/beauty-wabi-sabi