The hard part of consciousness is drawing the line left by the dissolution of Cartesian dualism. Some matter is not conscious, other matter is. How finely can

The hard part of consciousness is drawing the line left by the dissolution of Cartesian dualism. Some matter is not conscious, other matter is. How finely can we draw the boundaries between the two? Dualism drew a metaphysical line between matter and spirit but we have to draw a manifold around and through a physical brain to locate conscious experience.