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imagine that the film moves in such a way that at each moment it is
quitting the surface at which it is just arriving; and if it is not
restricted to the space of our ordinary intuition
we may say that the character of its motion describes defines determines
a particular solid space, tridimensional at
each point of it. This space, probably much
more peculiar than the simple space we know,
might, for aught we can see, be occupied all
at once by a body. And we cannot see why
this body should not move so that at every
instant every part of it with possible exceptions should
it should altogether quit the space that it at
that instant occupies; and so on.

Here we see that the introduction of abstractions
has led us to conceptions some of which, at any
rate, are of the highest value. The others teach us
still more if it can in any way be shown that