Introspection is the best place to start.
For example, when you look at a tree you are not conscious of all of the leaves. Yet, you can also be conscious of leaves or a group of leaves on a tree.
What is the difference?
Furthermore, when you are conscious of a leaf, what does it mean? What goes through your head?
I should refer you to my edit above.
Anyway, I've introspected for England and it has been very interesting at times. If I do your leaf and tree experiment it will tell me all sorts of things about everything that isn't consciousness (using my understanding of the word consciousness). All the things you mention, awareness of groups of leaves not individuals, what goes through my head etc. are all things I am conscious of. The aren't the consciousness.
To use an unhelpful analogy, we can project a movie onto a screen, the pictures dance and change. But we only see the movie because the pictures hit the screen. Without the screen there is nothing to see. Consciousness is the screen. Thoughts, feelings, emotions and perceptions are the projected movie.
OK, so its a crap analogy but to me the difference between consciousness and perception is as big and obvious as the difference between the projected light of a movie and the screen it lands on. It's not an intellectual thing either, my consciousness feels very real.
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