Systems are a fundamental part of everything - many variegated components come together to create one complete spectral whole. Systems are very useful in philosophy for understanding phenomena as cohesive groupings or aggregations, without implying that there are divisible parts. Systems work as wholes, and although systems can be picked apart and each component can be analyzed, the results of analysis are most meaningful when we are able to evaluate a system for its vicious cycles (decrementing loops and motions) and virtuous cycles (self-validating and positive loops and motions).
Can Systems teach us more about the structure of the universe or the Nature of Being? Systems bring us a new tool for working with the world. We can look at the human body as a collection of cells, and talk about how each cell has its own function, but the individual cells only have purpose insofar as we, as beings, are capable of making use of our transitory bodies and limbic instruments to serve us and one another in the world and in this life.
As humans, our central nervous system and our sympathetic nervous systems (sympathetic pictured here, with the spinal cord and functional mappings) are only understandable when looked at in the aggregate. We can focus on an individual part or limb, but we would be neglecting the beautiful recycling and recirculating of all the "other" components that are placed in the shadow once we indicate a point of interest.
Systems can often be inferred by analogy: the earth with its waters and humans is like the human body with its blood and red blood cells. It is very exhilarating to find helpful systems mappings that show us the interconnectedness of all things, human and physical, psychic and material, scientific and non-ordinary. Systems is an interesting field that can be applied to most any discipline. Mind maps are a great tool for distilling large, unfocused, empirical information into glutative chunks that stick together like wet dough. We can form various associations and categories without deciding on a rigid structure. Systems can bend and adjust to their surroundings just like living organisms, so our boundary lines must be sufficiently accommodating.
Although systems create various products, situations, states, and outcomes, there are derivable laws and relations that are true of almost all systems. It's interesting to consider that through observation of seemingly disparate phenomena, we can come to an umbrella-like understanding that pervades a multiplicity of systems, even if they assume different shapes and textures and apply to different domains. Take, for example, the similarity in outcome for a snowflake and a flower. Were we to analyze the process for "ending up this way" we may find that the snowflake harps on natural resonance with its crystalline water, and that the flower harps on natural surrounding conditions such as pollination, sun exposure, and climate.
Just looking to the human body and the planet earth alone, we can find many parallels, that may make it apparent that the elemental systems of the universe are not only accessible to our participation, but are analogous to our own mortal coil. The health and balance of an individual or a planet can both be seen when we regard each as a holistic system. Consider that the amount of the surface of the earth covered in water, and the amount of water that swirls around our bodies, are roughly proportional.