How does Huxley create a dramatic sense of contrast in Brave New World?

I think the most obvious comparison that is featured in
the novel is the way that the sterilised, programmed and ordered world of the new
society that dominates earth is contrasted with the life on the reservation that Bernard
and Lenina are going to visit. Note how the Director of the Reservation describes life
their for them, hoping to scare Lenina:

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...about sixty thousand Indians and
half-breeds... absolute savages... our inspectors occasionally visit... otherwise, no
communication whatever with the civilised world... stil preserve their repulsive habits
and customs... marriage, if you know what that is, my dear young lady; families... no
conditioning... monstrous supersitions... Christianity and totemism and ancestor
worship... extinct languages, such as Zuni and Spanish and Athapascan... pumas,
porcupines and other ferocious animals... infectious diseases... priests... venomous
lizards.

Note the way that
when they finally arrive and from this description, we can see that life on the Reserve
is actually the kind of life that we are most used to, and we can relate to. Thus it is
that the author shows us the immense contrast between our lives now and the lives that
the majority of humans in this possible future world enjoy: a life where everything is
conditioned and everything is safe, and institutions such as marriage and childbirth
have been eradicated. Above all, it is a "life" were the humans are persented as nothing
more than robots.