> "It is not only colours and sounds and so on that are absent from the
> scientific world of matter, but also space as we get it through sight
> or touch. It is essential to science that its matter should be in a
> space, but the space in which it is cannot be exactly the space we see
> or feel. To begin with, space as we see it is not the same as space as
> we get it by the sense of touch; it is only by experience in infancy
> that **we learn how to touch things we see, or how to get a sight of
> things which we feel touching us**. But the space of science is
> neutral as between touch and sight; thus it cannot be either the space
> of touch or the space of sight."

> [The Problems of Philosophy, Bertrand Russell, Chapter III]

How should I understand the bold text?