
"What is consciousness? How does it arise? And why does it exist? We take our experience of being in the world for granted. But the very existence of consciousness raises profound questions: Why would any collection of matter in the universe be conscious? How are we able to think about this? And why should we? /In this wonderfully accessible book, Annaka Harris guides us through the evolving definitions, philosophies, and scientific findings that probe our limited understanding of consciousness. Where does it reside, and what gives rise to it? Could it be an illusion, or a universal property of all matter? As we try to understand consciousness, we must grapple with how to define it and, in the age of artificial intelligence, who or what might possess it. /Conscious offers lively and challenging arguments that alter our ideas about consciousness--allowing us to think freely about it for ourselves, if indeed we can." -- book jacket.
I.e., in the vain search for the place to draw “the line” between what animals or systems are conscious and which aren’t, (viruses? Amoebas? The smallest insect?) what if consciousness can be seen as a property of existence? Then, clearly, different systems (such as humans) have wildly different experiences (a.k.a. contents of consciousness) than rocks or shrimp or trees etc., but if you take Thomas Nagel’s phrasing for this—that if there is something it is like to be a rock or a shrimp or a tree, then that is conscious—then it seems to me that there IS something that it is like to be the cosmos.
If you're more interested in consciousness a good place to start is "Conscious: A Brief Guide to the Fundamental Mystery of the Mind" by Annaka Harris.