Consciousness (n.) gets pictured as a world: we people a space with impressions.
Consciousness (n.) that something is so can disturb me at work; knowledge cannot.
Consciousness (n.) cannot be pointed to with a sweeping gesture of 'all that'; one asks, what then am I now seeing?
Consciousness (n.) can be seen in another's face — the light in it, the fury in it, as plain as in your own breast.
Consciousness (n.) can be feigned away but not feigned: a man can pretend to be unconscious, but conscious?
Consciousness (n.) asserted beyond doubt might be met as one meets someone's humming — with no answer at all.