Today is the official U.S. release day of my newest book,
The Weirdness of the World!
As a teaser, here's the introduction:
In Praise of Weirdness
The weird sisters, hand in hand,
Posters of the sea and land,
Thus do go about, about:
Thrice to thine and thrice to mine
And thrice again, to make up nine.
Peace! the charm’s wound up.
—Shakespeare, Macbeth, Act I, scene iii
Weird often saveth
The undoomed hero if doughty his valor!
—Beowulf, X.14–15, translated by J. Lesslie Hall
The word “weird” has deep roots in old English, originally as a noun
for fate or magic, later evolving toward its present use as an adjective for
the uncanny or peculiar. By the 1980s, it had fruited as the choicest
middle-school insult against unstylish kids like me who spent their free
time playing with figurines of wizards and listening to obscure science
fiction radio shows. If the “normal” is the conventional, ordinary, and
readily understood, the weird is what defies that.
The world is weird -- deeply, pervasively so, weird to its core, or so I
will argue in this book. Among the weirdest things about Earth is that
certain complex bags of mostly water can pause to reflect on the most
fundamental questions there are. We can philosophize to the limits of
our comprehension and peer into the fog beyond those limits. We can
contemplate the foundations of reality, and the basis of our understanding of those foundations, and the necessary conditions of the basis of
our understanding of those foundations, and so on, trying always to
peer behind the next curtain, even with no clear method and no great
hope of a satisfying end to the inquiry. In this respect, we vastly outgeek
bluebirds and kangaroos and are rightly a source of amazement to
ourselves.
I will argue that careful inquiry into fundamental questions about
consciousness and cosmology reveals not a set of readily comprehensible answers but instead a complex blossoming of bizarre possibilities.
These possibilities compete with one another, or combine in non-obvious ways. Philosophical and cosmological inquiry teaches us that
something radically contrary to common sense must be true about the
fundamental structures of the mind and the world, while leaving us
poorly equipped to determine where exactly the truth lies among the
various weird possibilities.
We needn’t feel disappointed by this outcome. The world is richer
and more interesting for escaping our understanding. How boring it
would be if everything made sense!
1. My Weird Thesis
Consider three huge questions: What is the fundamental structure of
the cosmos? How does human consciousness fit into it? What should
we value? What I will argue in this book -- with emphasis on the first
two questions but also sometimes touching on the third -- is (1) the
answers to these questions are currently beyond our capacity to know,
and (2) we do nonetheless know at least this: Whatever the truth is, it’s
weird. Careful reflection will reveal that every viable theory on these
grand topics is both bizarre and dubious. In chapter 2 (“Universal
Bizarreness and Universal Dubiety”), I will call this the Universal
Bizarreness thesis and the Universal Dubiety thesis. Something that seems almost too preposterous to believe must be true, but we lack the
means to resolve which of the various preposterous-seeming options is
in fact correct. If you’ve ever wondered why every wide-ranging,
foundations-minded philosopher in the history of Earth has held bizarre metaphysical or cosmological views (I challenge you to find an
exception!) -- with each philosopher holding, seemingly, a different set
of bizarre views -- chapter 2 offers an explanation.
I will argue that every approach to cosmology and consciousness has
implications that run strikingly contrary to mainstream “common
sense” and that, partly in consequence, we ought to hold such theories
only tentatively. Sometimes we can be justified in simply abandoning
what we previously thought of as common sense, when we have firm
scientific grounds for thinking otherwise; but questions of the sort I
explore in this book test the limits of scientific inquiry. Concerning such
matters, nothing is firm -- neither common sense, nor science, nor any
of our other epistemic tools. The nature and value of scientific inquiry
itself rely on disputable assumptions about the fundamental structure
of the mind and the world, as I discuss in chapters on skepticism (chapter 4), idealism (chapter 5), and whether the external world exists
(chapter 6).
On a philosopher’s time scale -- where a few decades ago is “recent”
and a few decades from now is “soon” -- we live in a time of change, with
cosmological theories and theories of consciousness rising and receding
in popularity based mainly on broad promise and what captures researchers’ imaginations. We ought not trust that the current range of
mainstream theories will closely resemble the range in a hundred years,
much less the actual truth.
2. Varieties of Cosmological Weirdness
To establish that the world is cosmologically weird, maybe all that is
needed is relativity theory and quantum mechanics.
According to relativity theory, if your twin accelerates away from you
at very high speed, then returns, much less time will have passed for the
traveler than for you who stayed here on Earth -- the so-called Twin Paradox. According to the most straightforward interpretation of quantum mechanics, if you observe what we ordinarily consider to be a
chance event, there’s also an equally real, equally existing version of you
in another “world” who shares your past but for whom the event turned
out differently. (Or maybe your act of observation caused the event to
turn out one way rather than the other, or maybe some other bizarre
thing is true, depending on the correct interpretation of quantum mechanics, but it’s widely accepted that there are no non-bizarre interpretations.) So if you observe the chance decay of a uranium atom, for
example, there’s another world branching of from this one, containing
a counterpart of you who observes the atom not to have decayed. If we
accept that view, then the cosmos contains a myriad of different, equally
real worlds, each with different versions of you and your friends and
everything you know, all splitting off from a common past.
I won’t dwell on those particular cosmological peculiarities, since
they are familiar to academic readers and well handled elsewhere.
However, some equally fundamental cosmological issues are typically
addressed by philosophers rather than scientific cosmologists.
One is the possibility that the cosmos is nowhere near as large as we
ordinarily assume -- perhaps just you and your immediate environment
(chapter 4) or perhaps even just your own mind and nothing else (chapter 6). Although these possibilities might appear unlikely, they are
worth considering seriously, to assess how confident we ought to be in
their falsity, and on what grounds. I will argue that it’s reasonable not to
entirely dismiss such skeptical possibilities. Alternatively, and more in
line with mainstream physical theory, the cosmos might be infinite,
which brings its own train of bizarre consequences (chapter 7).
Another possibility is that we live inside a simulated reality or a
pocket universe, embedded in a much larger structure about which we
know virtually nothing (chapters 4 and 5). Yet another possibility is that
our experience of three-dimensional spatiality is a product of our own
minds that doesn’t reflect the underlying structure of reality (chapter 5)
or that our sensory experience maps only loosely onto the underlying
structure of reality (chapter 9).
Still another set of questions concerns the relationship of mind to
cosmos. Is conscious experience abundant in the universe, or does it require the delicate coordination of rare events (chapter 10)? Is consciousness purely a matter of having the right physical structure, or
might it require something non-physical (chapter 2)? Under what conditions might a group of organisms give rise to group-level consciousness
(chapter 3)? What would it take to build a conscious machine, if that is
possible at all -- and what should we do if we don’t know whether we
have succeeded (chapter 11)?
In each of our heads there are about as many neurons as stars in our
galaxy, and each neuron is arguably more structurally complex than any
star system that does not contain life. There is as much complexity and
mystery inside as out.
The repeated theme: In the most fundamental matters of consciousness and cosmology, neither common sense, nor early twenty-first-century empirical science, nor armchair philosophical theorizing is
entirely trustworthy. The rational response is to distribute our credence
across a wide range of bizarre options.
Each chapter is meant to be separately comprehensible. Please feel
free to skip ahead, reading any subset of them in any order.
3. Philosophy That Closes versus Philosophy That Opens
You are reading a philosophy book -- voluntarily, let’s suppose. Why?
Some people read philosophy because they believe it reveals profound,
fundamental truths about the way the world really is and the one right
manner to live. Others like the beauty of grand philosophical systems.
Still others like the clever back-and-forth of philosophical dispute.
What I like most is none of these. I love philosophy best when it opens
my mind -- when it reveals ways the world could be, possible approaches
to life, lenses through which I might see and value things around me,
which I might not other wise have considered.
Philosophy can aim to open or to close. Suppose you enter Philosophical Topic X imagining three viable, mutually exclusive possibilities, A, B, and C. The philosophy of closing aims to reduce the three to
one. It aims to convince you that possibility A is correct and the others wrong. If it succeeds, you know the truth about Topic X: A is the answer! In contrast, the philosophy of opening aims to add new possibilities to the mix -- possibilities that you hadn’t considered before or had considered but too quickly dismissed. Instead of reducing three to one,
three grows to maybe five, with new possibilities D and E. We can learn
by addition as well as subtraction. We can learn that the range of viable
possibilities is broader than we had assumed.
For me, the greatest philosophical thrill is realizing that something
I’d long taken for granted might not be true, that some “obvious” apparent truth is in fact doubtable -- not just abstractly and hypothetically
doubtable, but really, seriously, in-my-gut doubtable. The ground shifts
beneath me. Where I’d thought there would be floor, there is instead
open space I hadn’t previously seen. My mind spins in new, unfamiliar
directions. I wonder, and the world itself seems to glow with a new wondrousness. The cosmos expands, bigger with possibility, more complex,
more unfathomable. I feel small and confused, but in a good way.
Let’s test the boundaries of the best current work in science and philosophy. Let’s launch ourselves at questions monstrously large and formidable. Let’s contemplate these questions carefully, with serious scholarly
rigor, pushing against the edge of human knowledge. That is an intrinsically worthwhile activity, worth some of our time in a society generous
enough to permit us such time, even if the answers elude us.
My middle-school self who used dice and thrift-shop costumes to
imagine astronauts and wizards is now a middle-aged philosopher who
uses twenty-first-century science and philosophy to imagine the shape
of the cosmos and the magic of consciousness. Join me! If doughty our
valor, mayhap the weird saveth us.