"a similarity between a physical property and a felt property is worse than vague: it is like the similarity between abstract and concave!"

Or so Dennett would have us believe! But that is itself a totally unsubstantiated paradigmatic assumption on his part! It is at least equally likely, prima facie, that the felt property is identically equal ontologically to the physical property, in which case they could not help but be isomorphic, because they are one and the same thing!