Organisations are abstractions. [English is not my native language so I’m not sure that’s the most appropriate word.] What exists are individuals and their relationships of collaboration and learning. Or as I’ve heard Thomas Dönnebrink explain — organisation is a verb, not noun.
I like how Yuval Noah Harari in Sapiens: A Brief History of Humankind classified reality into three categories: objective reality, subjective reality and intersubjective reality. Organisations exist only within subjective and intersubjective reality, phisical resources managed by organisations exist in objective reality (maybe with exception of monetary resources, but that’s another story) — and people, individuals, exist across all three categories.