> You can't say something exists if you don't have a definition for it A conscious being experiences quaila. Which just shifts the problem to defining quaila-w

> You can't say something exists if you don't have a definition for it A conscious being experiences quaila. Which just shifts the problem to defining quaila-which I think we can, using the famous “Mary the colour scientist” thought experiment. A congenitally blind person could learn every single possible scientific fact about colour, but they’d still be no closer to knowing what it is like to see it. Suppose they manage to use all this knowledge to cure their blindness - now they’ve learnt something they didn’t know before - but since they already knew every scientific fact about it, the new thing they’ve learnt is not a scientific fact, it is something else - let us call that “quaila”. And now we’ve defined qualia, we can define “consciousness” in terms of it. I know I am conscious because I know I experience qualia. To the best of my knowledge, rocks don’t, so they aren’t.