Vagueness and the Evolution of Consciousness: Through the Looking Glass

When Alice stepped through the looking-glass, she encountered a peculiar world where she meets animated chess pieces, characters from nursery rhymes, and talking animals. Everything there is inside out and upside down: so it is with consciousness. Reflecting on the inception of consciousness, it is natural to suppose that there are just two alternatives. Either consciousness appeared in living beings suddenly, like a light switch turning on, or it appeared gradually, like the biological dev...