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PHILOSOPHY PATHWAYS electronic journal


P H I L O S O P H Y   P A T H W A Y S                   ISSN 2043-0728

Issue number 41
22nd September 2002


I. The Man Who Folded Himself: Afterword

II. Response to Ben Basing by Daniel Pech

III. Wood Paths



     Die Tatsachen im logischen Raum sind die Welt
     Wittgenstein 'Tractatus Logico-Philosophicus' 1.13

Once upon a time, travelling to the past or future was a simple affair. "There
is no difference between time and any of the three dimensions of space," H.G.
Wells' Time Traveller tells his sceptical diner guests, "except that our
consciousness moves along it". We are carried along with the flow of time, like
passengers on a train with no doors which will never stop, gazing at the scenery
passing by. A time machine allows you to get off the train. For the time
traveller, time is just another kind of "space".

It intrigues me to think that as I tentatively put down these words there is,
somewhere in the not-too distant future, the finished version of this Afterword
waiting to be e-mailed to the publishers. Though the blank page holds no terror
for me, I would certainly be tempted -- if I had Dan's time belt -- to sneak a
peek at what I wrote. Better still, wait until The Man Who Folded Himself is in
the book shops, then I know I will be looking at the final version.

Now I imagine I am back in the present, holding the book in my hands. I don't
have to write another word because it's already been written. I can just copy
it out. But if my piece is already written, who (or what?) did all the hard
work of actually writing it?

This is too much for my brain to cope with. Let's try something simpler. There
isn't anything in the novel quite simple enough for our purposes (you'll see
why), so I am going to compose a miniature time travel story of my own:

You wake up one morning to find Dan's time belt on the table next to your bed.
(You recognize it immediately because you have just finished reading the
novel.) "This is great," you think, "I'm going to take a short hop to yesterday
evening to warn myself." But then it dawns on you that you can't do that because
you didn't. No scribbled note was found, your double did not mysteriously appear
at the front door. You feel defiant. "But I can, and I will!" So you go.

Now, we have to tell the story all over again:

Last night, your double mysteriously appeared at the front door. "Guess what,
tomorrow morning you are going to be the proud owner of one of these. Take care
how you use it!" Before you have time to blurt out a reply, your double taps a
button and is gone. Next morning, the prophecy turns out to be true. Now you
think, "I have to go to yesterday evening to warn myself." But why bother? You
already know. So you don't go.


The basic ground rule for writing any piece of fiction is that the story should
add up. The plot should be consistent. It should make logical sense. Sometimes a
writer breaks the consistency rule, and sometimes an inattentive reader fails to
notice. But that's really not a satisfactory state of affairs. So the first
question we have to ask is, Is the story about the time belt on the bedside
table consistent? Is there a way to interpret what happened that gives it the
required coherence?

Some readers' imaginations may stretch further than others. But sometimes it
can stretch too far. One of my teachers once jokingly remarked that his
imagination was better than mine because he could imagine a square circle.

     "Want to know what it looks like?"

     "I give up, Sir. Tell me."

     "A bit fuzzy round the edges!"

When the plot of a story or novel is inconsistent, our mental picture goes
fuzzy. We see one part, then another, but, try as we might, we cannot connect
the two.

There is a way to make the story about the bedside table coherent. But to do
that we first need to go back in time to get some help from one of the foremost
thinkers of the Ancient world.

Two and a half thousand years ago, Aristotle asked the following question: In
what sense can we regard the statement, "There will be a sea battle tomorrow"
as true or false at the time at which it is uttered? (The Ancient Greeks were
always having sea battles.) If it is a fact now that a sea battle takes place
tomorrow then we are condemned to fatalism. The same result follows if it is a
fact now that a sea battle will not take place tomorrow. Either way, the future
is all laid out. Thinking and deciding are mere illusions. That is just how
things are for passengers on the time train I mentioned earlier.

Aristotle won't accept this. His conclusion agrees with common sense: that
while the past is necessarily what it is -- what is done is done -- the future
is contingent. There is a possible future where a sea battle takes place and
another possible future in which it does not take place. So there is still
scope for human deliberation, and fatalism is avoided.

There are two separate versions of my story about the time belt, taking place
in two alternative universes, or different possible futures. And each version
of the story branches out into two more possible futures. Let's run through
them all:

     A1I did not go back to the past to warn myself
     and I decide not to warn myself.

     A2I did not go back to the past to warn myself,
     but, despite this, I decide to warn myself.

     B1I did go back to the past to warn myself and
     I decide to warn myself.

     B2I did go back to the past to warn myself, but,
     despite this, I decide not to warn myself.

Now we can see that Aristotle's theory of future contingency isn't enough to
save the coherence of the story. In either version, A or B, one possible choice
I can make is that I go back to change my own past.

So we have to turn Aristotle's theory on its head and apply it to the past too.
What is done is not necessarily done. It can be undone. But how? In the first
version of the story, I remember distinctly that I did not warn myself. If I go
back into the past now to face the 'myself' of yesterday then the person who
receives the warning cannot be me. He cannot exist in my past, but only in an
alternative past that comes into existence the moment I tap the button on my
time belt.

It is sobering to realize that you cannot change the past one iota. All you can
do is bring into existence new versions of the history of the universe where the
past is different from what it in fact was. You cannot use the time belt to stop
the Holocaust by murdering Hitler when he was 20, you can only create a universe
where the Holocaust never happened. You cannot save the life of President
Kennedy, you can only save the life of Kennedy's double. You can't prevent the
actual horror and suffering of September 11th. You can only distance yourself
from it, by taking yourself away to another world where the Twin Towers still

It takes Dan quite a while to grasp the full implications of this idea. Like
H.G. Wells' hero struggling to understand the ways of the Eloi and the
Morlocks, Dan -- the reader too! -- struggles to catch up with the plot. He
tries one unsatisfactory explanation, then another, and it is not until nearly
half way through the novel that light finally begins to dawn: "When you use the
time belt, you aren't really jumping through time, that's the illusion; what
you're actually doing is leaving one timestream and jumping to -- maybe even
creating -- another."


Let us leave the subjective standpoint of the time traveller for a moment and
consider the objective view. For if the events we are describing are
consistent, then there must be a way to tell the same story from the point of
view of an external observer.

Imagine that you are an all-seeing deity, not quite as malevolent as Descartes'
Evil Demon, but not quite as beneficent as Descartes' Perfect Being either.
Before you is spread the entire history of Creation, from the big bang to the
big crunch. Or possibly an infinite series of bangs and crunches stretching in
both directions (choose your favourite cosmological theory). Everything is held
together by physical laws, laws which state that 'if A happens then B will
happen'. A mixture of Oxygen and Hydrogen gas when ignited combines to form
water. People who drink cyanide generally die. Nothing comes from nothing:
whatever happens after is the result of what happened before, according to the
universal, immutable laws of physics.

Perhaps out of a sense of mischief -- or maybe just because you like to
experiment -- you decide to introduce a new variable into the equation. You
make an exception to the laws of physics, or rather you add a new super-law,
and let human ingenuity do the rest. That is Dan's time belt.

In the time travel universe, or universe of universes, we cannot allow that
anything goes. For that would lead to inconsistency. There must be rules or
limits which determine what can or cannot happen. The laws which govern the
time belt are not the laws of physics as we know it (of course, it could turn
out that we are wrong about that!) but they are laws nonetheless: there is no
logical reason why the laws of physics and the laws governing the time belt
should not be compatible. The time belt is no magical device but has inner
workings which operate in an intelligible way. Otherwise the time traveller
would never know for sure where he or she was going.

Anyone who has ever used a word processor can pick up the idea very easily.
Say, you're writing an essay and you're unhappy with what you said in paragraph
three. So you cut out a sentence and insert it into paragraph four. Now your
argument begins to look convincing. However, to accommodate the change you need
to say other things too. Out go paragraphs five and six, and in their place
something entirely different. You read through the revised version and decide
that another sentence needs to be moved. And so on, until you are satisfied
that the whole piece has the quality you are aiming for. "I am the artist of
time," realizes Dan.

When Dan puts on the time belt, it is as if he acquires the power to cut
himself out of the timestream, out of the text of human history, and paste his
momentary self into another point in time in a hitherto identical universe.
Simple enough: until you realize that the process can be iterated, without end.
The process is what mathematicians call 'recursion'. You apply a rule or process
to a product of that same rule or process, over and over.

From the point of view of our mischievous deity, the result is a dizzyingly
complex structure of possible histories of the universe, branching out,
spiralling, looping back. No individual gets to see the whole structure. From
any given point, certain histories are accessible, others inaccessible.
Tragically, for Dan, worlds that were once accessible cease to be accessible. A
time belt does not give you the power to turn back the clock of your own life.


What kind of thing must time be, if all this is possible? What kind of thing is
a person or 'I', that can move from one world, one history of the universe to
another, miraculously preserving the invisible thread of self-identity?

I don't know what kind of thing time would be in a time travel universe,
because I don't know what time is. I don't understand where the past goes. I
don't know how to define what makes now different from all other 'nows'. Dan's
story is intriguing, gripping, but the reason is not merely because time travel
is an exotic idea. "What is time?" is a mind-boggling question. So is the
question, "What is 'I'?"

There is one point in the novel where Dan, or rather a version of Dan, succumbs
to paranoid schizophrenia. Dan's first thought is, "If there are an infinite
number of Dan's, then each one thinks he is choosing his own course. But that
isn't so. Each one is only playing out his preordained instructions --
excising, altering, and designing his timestream to fit his psychological
template and following his emotional programming to its illogical extreme." But
then later, "It bothers me -- this me. I need to know that there is some
important reason for my existence. There must be something special about me."
There is such a reason, Dan finally realizes as he slips into madness: "I am

Like the problem of time, the nature of "I" is a problem for us in the actual
world, not just for Dan in the world of the novel. What makes the problem so
acute for Dan is that there are so many versions of Dan around. But that is a
point of mere detail. Each of us, when we say "I" and point to ourselves
realize that all our physical and mental qualities put together are not enough
to make me "I". An exact copy of me, thought for thought, molecule for
molecule, would not be "I". Then what is sufficient to make me "I"? What is the
extra ingredient for individuality? I don't know any thinker who has given a
satisfactory answer to that question.



Aristotle 'De Interpretatione' E.M. Edghill trans. in 'The Philosophy of Time'
Gale, R. ed. Macmillan 1968 (pp. 179-182)

Descartes 'Meditations on First Philosophy' 1641 (several editions)

Lewis, D. "The Paradoxes of Time Travel" in 'The Philosophy of Time', Le
Poidevin, R. and MacBeath, M. eds. OUP 1993 (pp. 134-146)

Wells, H.G. 'The Time Machine' 1895 (downloadable e-text)

Wittgenstein, L. 'Tractatus Logico-Philosophicu's Pears, D.F. and McGuinness
B.F. trans. Routledge 1961


I would like to thank Steven Ravett Brown, Tom Farrow, Hubertus Fremerey, Rune
Froseth, Adriano Lima and Kenneth Stern who responded helpfully to questions
about time travel which I posted on the Pathways web site.

(c) Geoffrey Klempner 2002



In 'Philosophy Pathways' Issue 40 Ben Basing posed the question,

"If philosophy is for something is it possible that philosophers might achieve
their objective?"

This, I think, is the wrong question. The reason I think this is because "there
are no philosophers". I think the right question must be an entirely personal
one: If y is for something, is it possible for you to achieve your objective?
(Where y is an algebraic replacement for any word like 'philosophy' that tends
already to have some overly rigid definition in many people's minds---and this
over-rigidity because of the fallacy that a certain limited group of people are
philosophers and who have a specialized objective.)

Basing said,

"Unlike engineering or even writing poetry, philosophy seems to be very open

Something that is open ended might have to be given an open ended definition.

So, what do I say is a fair initial open ended definition of philosophy?

Philosophy is not any thing, it is merely the attempt by a finite mind
increasingly better to distinguish, extract, refine, and control the
recombination of, the elements of reality. Philosophy is the attempt to think
rightly, and this attempt is like trying to understand the simple instructions
to very complex dance moves which are being given to you over the phone---and
your mind has a thousand arms. While these arms may get in each other's the way
if some of them are in the wrong place, the problem is in determining which ones
really are in the wrong place. Philosophy is not something that you have the
option not to do---and the better you do it, the better off you are for any
situation in which you have the opportunity to put it to use.

(c) Daniel Pech 2002

E-mail: pnpmacknam@email.msn.com



     URL http://klempner.freeshell.org

Looking for a free UNIX provider on the internet, I came across the excellent
Lonestar SDF public UNIX system based in Bellevue, Washington USA, 'the only
all 64 bit public access supercomputing center'. I'm not quite sure what 64 bit
means, but their web site is called 'Super Dimensional Fortress' which impressed
me a lot.

     SDF web site: http://www.freeshell.org
     Telnet address: sdf.lonestar.org

My account came together with free web space which I decided to put to good
use. So I have gathered together a small collection of articles. These are
mostly talks I gave to live audiences - seminars at Warwick and Hull
Universities; talks at the South Place Ethical Society and Philosophical
Society of England; the Shap Conferences in Cumbria organized by Newcastle
University. The earliest article was written 1993.

The most recent piece is my Afterword to David Gerrold's science fiction time
travel classic 'The Man Who Folded Himself' commissioned by BenBella Books,
which I mentioned in the last issue (40) of 'Philosophy Pathways'.

Altogether, there are seven pieces. In calling the site 'Wood Paths' I was
partly thinking of Heidegger's later view of philosophy, but also my all-time
favourite philosophy quote, from the Introduction to F.H. Bradley's
metaphysical treatise 'Appearance and Reality' (1897):

     "When poetry, art, and religion have ceased wholly to
     interest, or when they show no longer any tendency to
     struggle with ultimate problems and to come to an
     understanding with them; when the sense of mystery and
     enchantment no longer draws the mind to wander aimlessly
     and to love it knows not what; when, in short, twilight has
     no charm - then metaphysics will be worthless."

(c) Geoffrey Klempner 2002

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