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Well-founded phenomena -LRB- phenomena bene fundata -RRB- , in the philosophy of Gottfried Leibniz , are ways in which the world falsely appears to us , but which are grounded in the way the world is -LRB- as opposed to dreams or hallucinations , which are false appearances that are not thus grounded -RRB- .. philosophy. philosophy. Gottfried Leibniz. Gottfried Leibniz. For Leibniz , the universe is made up of an infinite number of simple substances or monads , each of which contains a representation of the entire universe -LRB- past , present , and future -RRB- , and which are all causally isolated from one another -LRB- `` Monads have no windows through which anything could enter or depart . '' -RRB-. For the most part the monads ' perceptions are more or less confused and obscure , but some of them correspond either to the ways in which other monads are related or to the ways that the representation is genuinely ordered ; these are the well-founded phenomena .. In the world of ordinary experience we might call a rainbow a well-ordered phenomenon ; it appears to us to be a coloured arch in the sky , though there is in fact no arch there .. rainbow. rainbow. We are not suffering from hallucinations , though , for the appearance is grounded in the way the world is ordered -- in the behaviour of light , dust motes , water particles , etc. .. For Leibniz , there are two main categories of well-founded phenomena  : the ordinary world of individual objects and their interactions , and more abstract phenomena such as space , time , and causality .. space. space. time. time. causality. causality. This is also found in his expression of pre-established harmony being the basis of causation .. pre-established harmony. pre-established harmony