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A foundational model for understanding metaphysical systems along two fundamental dimensions. The first axis runs from Materialism (reality is fundamentally physical—matter, energy, particles) to Idealism (reality is fundamentally mental—consciousness, ideas, spirit). The second axis runs from Monism (reality is one substance or principle) to Pluralism (reality consists of many fundamental kinds). These two axes create four basic metaphysical orientations: materialist-monism (physicalism: everything is matter), materialist-pluralism (multiple kinds of physical stuff), idealist-monism (Advaita Vedanta: all is consciousness), idealist-pluralism (Leibniz: many mental substances). The model reveals that metaphysics isn't a single debate—it's a choice about what fundamentally exists and how many kinds of fundamental things there are.
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