The same holds for the many "dimensions" that are found in data sets. Web site traffic
statistics have many dimensions: IP address, date, time of day, page visited, previous page
visited, result code, browser, machine type, and so on. While each of these might be
examined in turn, they relate to distinct questions. Only a few of the variables are required
to answer a typical question, such as "How many people visited page x over the last three
months, and how has that changed each month?" Avoid trying to show a burdensome
multi-dimensional space that maps the many points of information.