Yes, well, the question of consciousness and objective reality is not all that interesting when confined to human beings since we share the same basic physiology. It gets interesting when we talk about intelligent creatures whose physical make-up and habitats are much different than ours, like octopuses and dolphins.Steve3007: Suppose person A and person B are standing in a room....
Octopi have a much more complex nervous system than we do, and they can feel, taste and inspect objects with their limbs. And dolphins are awake 24/7, they must stay awake to control their breathing, otherwise they would drown. They "pause" each of their brain hemispheres in turn while keeping the other one active, and apparently they don't dream. And they feel as well as hear sound vibrations. So all in all, these animals impression of reality has got to be a lot different than ours. For all intents and purposes, we live in different worlds.
If we ever encounter intelligent life on other planets, we can imagine that the difference in physiology and modes of apprehension between us could be so great as to make communication between us nearly impossible. Wouldn't that be a shame? To discover intelligent life and learn that our J.S. Bach and Louis Armstrong recordings are incomprehensible to them, resembling only anomalies in electrical currents or something.