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.
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