But the sensations *are* a property of the output. In a trivial sense: it is a fact about the output, that a human will perceive it in a certain way.

Can I ask you to taboo property.

I like to think there is some difference between a metals melting point and that it is Freds least favourite metal. I consider the second to be a property of Fred (that is how I would code it anyway), not of the metal.