Systems and their respective fields of sustainability are approached within the context of systems philosophy and ontology. A fundamental reflection is provided regarding the ontology of systems, the importance and dynamics of their respective fields of sustainability. Of a quantum nature, the systems’ fields of sustainability are argumentatively addressed as incorporating holographically all the elements that constitute the systems, accompanying, projectively, the whole game of survival, through an intense dynamics of systemic reflexivity and reflexibility, alerting the system to the signs of threat or opportunity.