Thanks for you reply Stevan. I don't have any great problem with your example, though I imagine the child would need to know the colour red beforehand. (Though even if s/he didn't I imagine the response could at least be be 'they are all the same colour'.)

What I do have a problem with, though, is knowing what your example has to do with the Nagel 'insight' which, if I have it right, is "There is something that it is like to be a conscious organism". What is the connection between that (rather gnomic) proposition and what you call "sampling of diverse positive instances"? And how precisely does your example refute my argument that Nagel is comparing something to itself?

DA