Ooh – this post-it notes wall works for me. Can I get it in orange?
[…] hierarchies come in many guises and are present nearly everywhere: you find them in applications, hypertexts, Websites, portals, operating systems, or data collections. For example, files on a hard disk, documents in a Website, functions and options in an application, as well as a computerized part list can be organized as a hierarchy. Despite this ubiquity, many users are not as experienced with hierarchies as some developers might believe; in general people have problems understanding and using hierarchies, which are essentially an abstract notion and not a “real life” object.
(via Adam Kalsey)