A huge question is whether events related to consciousness are
like the tip of the iceberg with the rest of the brain being support
machinery, or are conscious events not any more complex than
non-conscious mental events, there's just something different about
them. It could be that since awareness seems mostly to do with
processing novelty, awareness itself has a large degree of novelty
to it. The subjective aspect might come from the fact that we get
to tell the system what to do when it can't figure it out for itself,
which makes the system as a whole seem like an object to us;
therefore, we must be the subject.