Fundamental Difference
There is much discussion about whether AI programs should be called conscious. Most of us believe that there is a fundamental difference between human intelligence and that of machines: no matter how good an AI program becomes at showing behavior that suggests that it is conscious, the program is not conscious.
On the other hand…
there are those who believe that a human being is nothing more than a very complex collection of molecules moving around, so there is nothing that fundamentally distinguishes human beings from machines (both are collections of matter and energy).
Is Consciousness everywhere?
When the flush tank of a toilet fills up because someone flushed, the tank stops allowing water in when it is full (when the water reaches the fill valve). Why does it do that? Does the toilet know that it is full? Is it conscious of the fact?
Many would now say “No, of course not!” But when we look at the other camp, of people who don’t think there is an essential difference between conscious and nonconscious entities, these questions lead to an interesting idea: consciousness comes in degrees, and any machine (even a toilet) is conscious – just not as much as human beings are.
Alternatively, one could argue that there is no such thing as consciousness; that it is nothing more than the last remnant of human egocentrism, an attempt to set us apart from inanimate nature after having been removed from our pedestal. First by Copernicus, who argued that we are not at the center of the universe, and later by Darwin’s evolutionary theory, which states that we are not the pinnacle of creation – but just another mammal. Consciousness, like God and free will, is just another hypothesis that we don’t need to describe the world around us.
Consciousness is in the Eye of the Beholder
I don’t know who is right. My gut tells me (together with Occam’s Razor) that we should not want anything to do with superfluous hypotheses, so we should try to formulate physics and go through life assuming that there is no such thing as consciousness.
At the same time, I realize that there are more things in heaven and earth then are dreamt of in our philosophy – to paraphrase Shakespeare. Perhaps there is such a thing as consciousness that we just cannot measure (or measure yet).
Read this post to learn about the arrow of time – something else that is not part of the laws of nature and exists nonetheless.

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