A complex system that works is invariably found to have evolved from a simple system that worked. A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over with a working simple system.
John Gall (Systemantics: How Systems Really Work and How They Fail)
The World Wide Web is designed as an Evolutionary Architecture, in that its simple primitive is the Hyperlink. The act of linking provides a bottom-up emergent effect of creating a dynamic and distributed web of documents without imposing a top-down hierarchy (Prefer organic structure to hierarchical structure).
By defining simple rules and allowing architecture to evolve, systems have the capability to manage complexity and be exaptive to new problems and domains.