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sees something that must be THICK to the eye as well as LONG
to the eye (otherwise it would not be visible, if it had not
some thickness); and consequently he ought (it is argued)
to acknowledge that his countrymen are not only long and broad,
but also (though doubtless in a very slight degree) THICK or HIGH.
This objection is plausible, and, to Spacelanders,
almost irresistible, so that, I confess, when I first heard it,
I knew not what to reply. But my poor old friend's answer
appears to me completely to meet it.
"I admit," said he -- when I mentioned to him this objection --
"I admit the truth of your critic's facts, but I deny his conclusions.
It is true that we have really in Flatland a Third
unrecognized Dimension called 'height', just as it is also true
that you have really in Spaceland a Fourth unrecognized Dimension,
called by no name at present, but which I will call 'extra-height'.
But we can no more take cognizance of our 'height' than you can
of your 'extra-height'. Even I -- who have been in Spaceland,
and have had the privilege of understanding for twenty-four hours
the meaning of 'height' -- even I cannot now comprehend it,
nor realize it by the sense of sight or by any process of reason;
I can but apprehend it by faith.
"The reason is obvious. Dimension implies direction,
implies measurement, implies the more and the less. Now,
all our lines are EQUALLY and INFINITESIMALLY thick (or high,
whichever you like); consequently, there is nothing in them
to lead our minds to the conception of that Dimension.
No 'delicate micrometer' -- as has been suggested by one too hasty
Spaceland critic -- would in the least avail us; for we should not
know WHAT TO MEASURE, NOR IN WHAT DIRECTION. When we see a Line,
we see something that is long and BRIGHT; BRIGHTNESS,
as well as length, is necessary to the existence of a Line;
if the brightness vanishes, the Line is extinguished. Hence,
all my Flatland friends -- when I talk to them about the unrecognized
Dimension which is somehow visible in a Line -- say, 'Ah,
you mean BRIGHTNESS': and when I reply, 'No, I mean
a real Dimension', they at once retort, 'Then measure it,
or tell us in what direction it extends'; and this silences me,
for I can do neither. Only yesterday, when the Chief Circle
(in other words our High Priest) came to inspect the State Prison
and paid me his seventh annual visit, and when for the seventh time
he put me the question, 'Was I any better?' I tried to prove to him
that he was 'high', as well as long and broad, although he did not
know it. But what was his reply? 'You say I am "high"; measure my
"high-ness" and I will believe you.' What could I do? How could I
meet his challenge? I was crushed; and he left the room triumphant.
"Does this still seem strange to you? Then put yourself in
a similar position. Suppose a person of the Fourth Dimension,
condescending to visit you, were to say, 'Whenever you open your eyes,
you see a Plane (which is of Two Dimensions) and you INFER
a Solid (which is of Three); but in reality you also see
(though you do not recognize) a Fourth Dimension, which is not colour