Different levels of concept-space
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“But suppose you lack the knowledge to so tightly bind together the levels of your map. For example, you could have a “hand scanner” that showed a “hand” as a dot on a map (like an old-fashioned radar display), and similar scanners for fingers/thumbs/palms; then you would see a cluster of dots around the hand, but you would be able to imagine the hand-dot moving off from the others. So, even though the physical reality of the hand (that is, the thing the dot corresponds to) was identical with / strictly composed of the physical realities of the fingers and thumb and palm, you would not be able to see this fact; even if someone told you, or you guessed from the correspondence of the dots, you would only know the fact of reduction, not see it. You would still be able to imagine the hand dot moving around independently, even though, if the physical makeup of the sensors were held constant, it would be physically impossible for this to actually happen.” (Eliezer Yudkowsky, Rationality)
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Description of the Different levels of concept-space