This page is part of my personal knowledge database, that helps me to store and navigate my learnings.
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System

A System is made up of three kind of things:

For example: the digestive system, a football team, the solar system, a tree, a forest, …

What is not a system? A conglomeration of things that are not interconnected. For example: sand next to the road. You can add some (elements), remove some -> there is no change (but quantitative).

On the other hand: add/remove players -> changes the whole game. Add/remove planets -> changes the whole solar system. And so on for all systems

Parts of the system may or may not be changed: