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Kastrup argues that consciousness, not matter, is fundamental: objects like trees exist as differentiated things only when observed; without a mind to perceive them, they are just undifferentiated “ontological dust.” This raises the question of whether the world itself must be conscious to exist. The passage then surveys alternative theories of consciousness beyond physicalism—idealism, panpsychism, dualism, quantum and simulation theories, and “transmission” models—each trying to explain how consciousness relates to reality. All of these approaches, however, face challenges to plausibility.
In short: Consciousness may be the only thing that truly exists independently, and many competing theories try to account for reality in terms of the mind rather than matter.
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“Ontological dust” in your passage is Kastrup’s way of describing matter stripped of perception or consciousness—the raw, undifferentiated stuff of the universe that has no form, boundaries, or “thingness” unless a conscious observer perceives it. In other words, without a mind to organize it into objects, the tree, or any physical thing, is just existence in itself, lacking the structure or meaning we normally assign to it.
It’s a poetic way of saying: things only become “real” as perceived phenomena; otherwise, they’re just inert potential.
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Think of “ontological dust” like the pixels on a screen before an image loads. By themselves, they exist, but they’re meaningless—just tiny points of light. Only when the computer’s software (the “observer”) organizes them do they form a recognizable picture—a tree, a face, a landscape.
Similarly, in Kastrup’s view, the raw particles and waves of the universe are like those unorganized pixels: they exist, but they only become a “tree” or “rock” when consciousness perceives and structures them.
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Ontological dust: the raw, meaningless stuff of the universe that only becomes a “thing” when consciousness perceives it.
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