There’s no way to use “rules and facts” to express concepts like “chair” or “grass”, or “face” or “justice” or really anything. Any project trying to use deterministic symbolic logic to represent the world fundamentally misunderstands cognition.
Sure there is: a chair is anything upon which I can comfortably sit without breaking it.
Similarly, I've sat in some very uncomfortable chairs. In fact, I'd say the average chair is not a particularly comfortable one.
This seems to imply that what is or is not a chair is a subjective or conditional.