Caption: Hierarchy.

Original caption: "Diagram of a hierarchy of purposes/activities. The idea is that a person should organize less important activities in a way to support a larger goal. In this example, activities such as buying gas and clothing are necessary steps for the larger (more important) goal of being a nature photographer." (Somewhat edited.)

Credit/Permission: © User:Tomwsulcer, 2010 / Creative Commons CC BY-SA 1.0.
Image link: Wikimedia Commons.
Local file: local link: hierarchy.html.
File: Science file: hierarchy.html.