• Mental categories are hierarchical in nature; however, if yours are not, get tested for dementia.
• The top of all categorical structures is the category of God, which is why atheists resort to pantheism and the worship of Nature and/or the Universe.
• Triage is the medical principle of providing care based on a hierarchy of needs, for example, treating an injured heart is more important than treating an injured toe.
• Evolution, the favorite game and toy of many, has no meaning or purpose without a hierarchical structure and force.
• Science uses hierarchical organizations and structures to catalog and organize, for example, biology uses them for organizing species of animals and plants.