So I'm going to take a stab at creating a new topic here. When we talk about consciousness, the first thing that comes up for me is noone knows what that is, or can describe it. I think that's really important, because otherwise, if we pretend like we know what it is, and have a "definition of it", we can get very confused.
I do want to point out, however, that we can observe it (as the exercises on this site illustrate) and I think that contrast is really important.
So on the one hand, we can't really describe it, and on the other hand, it is here all of the time.