Most of us, most of the time, experience the world as it presents itself to us. Gradually a sense of ownership develops and we like to keep certain things nearest and within our control. As things multiply they get harder to control (have ready access to) so we develop containers whether they be corners of our space or open receptacles or closed boxes.
Taxonomy
As containers are formed within containers, there is typically a “tree” of relationships. There are other primary methods of organization such as “clouds.”
Security
Continuing with the idea of ownership, various doorways including passwords and access logs are developed.