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We build because we need shelter. We need shelter from sun, rain, wind and snow. Not much that modern people do takes place outdoors. Our activities mostly take place indoors. For these activities we may need air that is warmer or cooler than the air outdoors. We may also need less light by day and more light by night than is provided by nature.
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Why do we build?
We build because we need services.
We build because we need place indoors.
We build because we need work.
We build because we need shelter.