The world is organized in seemingly endless ways, but in reality, every form can be broken down into some taxonomic patterns.
Hierarchy, heterarchy, sequence, and hypertext are just a few common patterns. Most forms involve more than one of these.
A typical website has a hierarchical navigation system, a sequence for signing up or interacting with content, and hypertext links to related content.
A typical grocery store has a hierarchical aisle system, a heterarchical database for the clerk to retrieve product information by scanning a barcode, and sequences for checking out and other basic customer service tasks. I was even in a grocery store recently where each cart had a list of the aisle locations of the 25 most common products. A great use of hypertext.
A typical book has a sequence-based narrative, a hierarchical table of contents, and a set of facets allowing it to be retrieved with either the Dewey Decimal system at a library, or within a genre-based hierarchical system used in bookstores and websites like Amazon.com.