Poetic Naturalism: Not a Good Way of Talking
The “Big Picture” is an attempt by a physicist to explain our universe, up to and including culture. It begins with naturalism, the concept that there is a single, objective reality that follows a set of laws. We can discover those laws by observing that reality using scientific method. The author extends that (or dilutes it) to something he calls “Poetic Naturalism”. This means, in his words:
1) There are many ways of talking about the world.
2) All good ways must be consistent with each other and with the world.
3) Our purposes in the moment determine the best way of talking.
As I explore this book, I will try to explain why it is not is a very good way of talking about science. I also question what it has to do with poetry.
Emergence: More Than a Just Another Way of Talking
How can all the complexity that makes up life arise from only a few fundamental particles or forces? This requires the concept of emergence, meaning that complex systems have properties not found in their underlying components. In my opinion this is one of the most fundamental ideas in science, which is often ignored or only mentioned in passing. At least this book considers it in some detail.
The example of emergence he uses is air. At the microscopic level it is composed of individual molecules. But we can think of it as a fluid, with properties such as temperature that emerge from the underlying chaos of molecules flying around. But this example does not really support his conception that levels of emergence are completely separate. He tells us,
“Within their respective domains of applicability, each theory is autonomous. Organisms can be alive, even if their constituent atoms are not. Animals can be conscious even if their cells are not.”
The vital concept missing here is a bridging theory that links the different levels of emergence. In the air example the bridge is clear: the temperature of the fluid is the average speed of the individual molecules. There are bridges from quantum mechanics to chemistry to biology to neurology. On the other hand, the bridge to being alive or conscious is not so clear. This is the mystery I would love someone who knows that they are talking about to explore. I am still waiting. It seems this author would rather indulge in vague language than build bridges.
“So the fluid and molecular description are two different ways of talking about air.”
While trivially true, it obscures the reason why the descriptions need to be different. The real problem begins with the following idea that is repeated throughout the book:
“There is only the quantum wave function. Everything else is a convenient way of talking.”
I take this to mean that any science about emergent properties, meaning anything other than physics, is second rate, just a different way of talking about what the fundamental quantum wave functions do. It is curious that the term reductionism is mentioned by name only once in this book, where he appears to dismiss it out of hand. Yet how else can one interpret the following?
“Understanding what quantum fields and particles are and how they interact with each one another is a crucial part of comprehending what it means to be human.”
This flatly contradicts what he has just told us about the meaning of emergent properties. We do not need to know anything about fields or atoms to understand humans. Unfortunately, such contradictions are characteristic of this book.
The Universe and Beyond
“So the big bang does not actually mark the beginning of our universe; it marks the end of our theoretical understanding.”
What a beautiful way to express the limits of what science can explain! If only he would keep that in mind. Since we don’t know how our universe began, what does it mean to conjure up other universes?
I think of the multiverse as a kind of cosmic attic – a place where we put the stuff we don’t know what to do with. Why do particles end up in specific places when they come from a wave that is everywhere? Lets invent a new universe for every place they could appear. Is it a problem that string theory makes a gazillion contradictory predictions? Not if we make each one of them true in a different universe. It couldn’t be a problem with the theory itself. We are told that when you apply the uncertainty principle to the theory of the early rapid expansion of the universe, you get “eternal inflation” and an infinite universe. Could this be a sign that the theory is broken? Not when it gives us the logical equivalent to a multiverse - what a great place to put all the string theory universes! Never mind that cosmic inflation was developed from general relativity rather than string theory.
Perhaps the reader should be informed that these are three independent types of hypothetical multiverse, not multiple lines of evidence supporting a single multiverse theory. Oh well, I suppose all the multiverses let us be pleasantly diverse and inclusive with all our incomplete theories.
Disorderly Thinking About Time
“It is the tendency for entropy to increase that is responsible for time’s arrow.”
The second law of thermodynamics states that any system will tend to become more disordered (or have higher entropy) unless external work is done on it. There is another view that this “law”, rather than being fundamental, amounts to a tautology: the most likely future path of a system is the path that is most probable. Perhaps entropy is simply an emergent property of discrete objects appearing in the universe. Just as temperature emerges from the speed of the air molecules of a gas, entropy emerges from their distribution.
If entropy drives the emergence of time, one might expect that time flows at different rates depending on the local entropy, which we do not observe. Another view is that if general relativity is valid, space and time are intimately connected, and an expanding universe means that space-time itself is expanding. This predicts that new time will be created at the same rate everywhere in space.
Instead we are given a strange theory of how increasing entropy somehow leads to the development of complexity, apparently derived from observing cream poured into coffee. [I am not making this up.] But remember the part about external work reversing entropy? That work is done by gravity. However universe started, after the emergence of matter led to hydrogen atoms scattered around in a highly disordered state. Gravity pulled the atoms together to form stars, and eventually planets that can support life.
Gravity is the fundamental anti-entropy force in the universe that makes stars, planets and life possible. How could he leave this out?
Scepticism and Authority
Scepticism is the fundamental attitude required for scientific thinking. It does not mean to conveniently reject what you disagree with. It means question everything. There is no unquestioned authority, but there is relevant expertise that should be respected.
In the above paragraphs this amateur has questioned the authority of an accomplished expert in quantum physics. I have no right to an opinion in that subject. However, it is legitimate to observe that other equally good experts have differing views on these questions. While I have no right to decide which is true, I must conclude that these are still open questions, more open than this book suggests. There are a lot of open questions in science.
I think it is a common problem that scientists are used to advocating their viewpoints to other scientists who already understand the range of scientific opinion. When writing for the general public, they often forget the need to explain the competing viewpoints and the degree of scientific consensus about them. But here, it seems he is leaving out other viewpoints entirely.
A Bad Premonition: The End of Psychic Powers
His treatment of psychic powers is so heavy-handed that it resembles what one finds in pseudoscience. What do I mean by that?
A standard pseudoscience trick is to misrepresent the theory under attack. For example, the theory of evolution presented by Creationists bears little resemblance to the actual theory. Here he constantly refers to psychic powers as spoon bending. As far as I know, there is only one person claiming to be able to bend spoons with his mind. Contrary to this straw man, the usual claim of psychics is that information can flow from one person to another over great distances. Information is much lighter than spoons.
There is another pseudoscience technique that I call immunization. Spell out the fallacy you are about to employ, claim that you understand all about it and of course you would not do such a thing. Then liberally employ the trick. Now watch it in action:
“What we know about the laws of physics is sufficient to rule out the possibility of true psychic powers. That is a very strong claim. And more that a little bit dangerous: the trash heap of history is populated by scientists claiming to know more than they really do, or predicting that they will know almost everything any day now.”
He then gives a number of historical examples of scientists doing exactly that. But,
“My claim is different. I am claiming we know some things, and those things are enough to rule out some other things – including bending spoons with the power of your mind.”
Again, rather than bending spoons, psychics claim they are transmitting or receiving information. I do not see how a theory that claims its fields permeate the entire universe can rule this out. If quantum time really is a superposition of all moments, as he tells us, then even clairvoyance can look somewhat within the realm of possibility.
I do not claim to understand his technical explanation about why quantum field theory rules out other forces. I rather doubt that it can rule out life after death, as he claims. No theory can rule out what is outside that theory. That amounts to a claim of clairvoyance.
The reason to be sceptical about psychic powers is that they are difficult to demonstrate in a repeatable experiment. If we could reliably replicate psychic spoon bending, we would then have to modify quantum field theory. That is how science works – evidence first, theory follows.
Who Am I? Or, What Could I Possibly Be Thinking?
We just saw an example of scientific overreach – making a statement with a certainty that cannot be justified. Now we suddenly encounter the opposite, where scientific method gets tossed out the window when it comes to human beings. A remarkable (not in a good way) chapter titled “Who Am I?” addresses the currently popular transgender issue.
“For many people, the concepts of ‘male’ and ‘female’ are deeply rooted in the fabric of the world. Poetic naturalism sees things differently. Categories such as “male” and “female” are human inventions – stories we tell because it helps us make sense of our world. The basic stuff of reality is a quantum wave function. Everything else is an overlay, a vocabulary created by us for particular purposes. Therefore, if a person has two X chromosomes and identifies as male, what of it?”
A quantum wave function is also a “human invention”. Categories such as male and female are “human inventions” that encapsulate our best description of how reproduction in all complex life is fundamentally different from that of bacteria. In science, words have specific meanings. If a person has two X chromosomes, she is by definition genetically female. If you want to talk about the relationship between gender and behaviour, then find the appropriate language without changing the meaning of existing words.
I will quote the next few paragraphs in full so you can see how he mixes subjective and objective thinking for yourself:
“This can sound reminiscent of the old postmodern slogan that reality is socially constructed. [Yes, it certainly does.] There is a sense in which that is true. What is socially constructed are the ways we talk about the world, and if a particular way of talking involves concepts that a useful and fit the world quite accurately, it is fair to refer to those concepts as ‘real’. But we cannot forget that there is a single world underlying it all, and there is no sense in which the underlying world is socially constructed. It simply is, and we take on the task of discovering it, and inventing vocabularies with which to describe it.”
“People who think that transgenderism is a violation of the natural order sometimes like to use a slippery slope argument: If gender and sexuality are up for grabs, what about our basic identify as human beings? Is our species socially constructed?”
[A better term for “slippery slope” is false dichotomy. On one side there is an arbitrary and rigid definition of what gender roles should be, and on the other the idea that gender is an arbitrary construction and we can be whatever we want. But now he slides us all the way down that slippery slope.]
“There is, indeed, a condition known as ‘species dysphoria’. It is analogous to gender dysphoria but is characterized by a conviction that the subject belongs to a different species. Someone might think that, despite their nominal human form, they are actually a cat or a horse. Others go further, identifying with species that do not actually exist, like dragons or elves.”
“So poetic naturalism does not automatically endorse or condemn someone who thinks they are a dragon, or for that matter someone who thinks they are male or female. Rather, it helps us understand what questions we should ask: What vocabulary gives us the most insight into how this person is thinking and feeling? What helps us understand how they can be happy and healthy? What is the most useful way of conceptualizing this situation? We can certainly imagine thinking through these questions in good faith, and at the end concluding with ‘Sorry, Kevin. You are not a unicorn.’ ”
[Then why not, “Sorry, Kevin, your Y chromosome means you are not a woman.”]
“The real lives of people whose self-conceptions do not match those that society would like them to have can be extremely challenging, and their obstacles are highly personal. No amount of academic theorising is going to solve those problems with a single gesture. But if insist on talking about such situations on the bases of outdated ontologies, chances are high that we will end up doing more harm than good.”
Yes, actions have consequences. We should indeed be sceptical about “outdated ontologies” while remembering that traditional morality is the product of centuries of social evolution and may contain some truths based on long experience. We should therefore be even more sceptical about modern, constructed ontologies that are not based on evidence. They also have consequences and can do harm.
I suppose his writing might seem to be balanced and reasonable. I disagree. I think it is a false balance, slipping in ideas that are hostile to the spirit of science. He chooses to use the loaded term “social construction” which really means an arbitrary arrangement, usually imposed by the ruling elite to maintain their power over society. It is an explicit claim that the only reality is about relationships of power. This is the philosophy of subjectivism – the idea that we can believe whatever we want to believe to achieve our social goals. While he insists there is an underlying reality, one gets the impression there is no way to address emergent reality scientifically, so all we can do is “construct” ways of talking about it. The reader is left to cross the thin line to the next step, to construct any reality that conforms to their social world view.
What Happened to Scientific Method?
Scientific method is not a specific technique; it is a way of thinking that can be applied to any aspect of reality. It means challenging everything based on the best evidence available, recognizing uncertainty, and knowing when the evidence is insufficient to draw firm conclusions. Humility is (or should be) at its core. Unfortunately, scientists do not always live up to this standard. At least, when they do not, there is an objective way to challenge them. There is no way to challenge a subjectivist, as any opinion is arbitrarily constructed.
Human beings are not an arbitrary construction, or a blank slate. We have evolved over time to adapt to a changing environment. Our distinctive feature is our ability to cooperate, to behave as a social organism. Morality is how individuals modify their behaviour to make social cooperation possible. It has a genetic base with a culturally learned overlay. For those of us for whom evolutionary theory is not just another way of talking, this means there is an objective basis for morality that can be understood using scientific method.
That does not mean science can give us a complete and authoritative theory of morality that can be tested in a laboratory. It means we should question all moral concepts, including modern ones, and try to understand their consequences on the basis of evidence as much as possible. Using critical thinking rather than believing what is socially convenient means avoiding the following:
“Deciding how to be good is not like solving a math puzzle, or discovering a new fossil. It is like going out to dinner with a group of friends. We think about what we want for our individual selves, talk to others about their desires and how we can work together, and reason about how to make it happen.”
Dinner with like-minded friends is a recipe for groupthink. I suppose he picked up his moral relativism from his academic dinner mates.
I Have No Need For This Way of Talking
Let me mention one last logical fallacy: transfer of authority. An expert in physics is not necessarily an expert in philosophy or morality. In this case I often felt I was reading a guy who has read the same books I have. But he failed to pick up the message that there is no room for subjectivism in science. It is as if he has made a deal with the devil to let him keep the integrity of physics, but all the other emergent sciences (or “different ways of talking”) get thrown under the relativist bus.
Ideas and language have consequences. For example, if biology is just a way of talking, the benefits of immunization are simply a social construction. If you do not like this kind of thinking, then do not use the language that leads there. There is another word for the constructionist fallacy:
“Alternative Facts”
The other side has learned to play the game. After all, it is just another way of talking.
Although there is much of value here, I find it difficult to recommend a book that sells out the very integrity of science. He is a good writer, and I would happily read a book that sticks to his field of expertise. However, I will take my naturalism without the poor excuse for poetry, thank you very much.