Consciousness is: what it is like to experience something. Note this is different from self consciousness which is: what is it like to be something which experiences and know you are that thing.
Humans are certainly self conscious. Crabs are certainly conscious. Crystals certainly exist.
Where the boundaries are is an interesting question, but the categories certainly exist even if I can't draw a clean boundary around members.
Humans are certainly self conscious. Crabs are certainly conscious. Crystals certainly exist.
Where the boundaries are is an interesting question, but the categories certainly exist even if I can't draw a clean boundary around members.