All people who work with their hands are partly invisible, and the more important the work they do, the less visible they are. Still, a white skin is always fairly conspicuous. In northern Europe, when you see a labourer ploughing a field, you probably give him a second glance. In a hot country, anywhere south of Gibraltar or east of Suez, the chances are that you don’t even see him. I have noticed this again and again. In a tropical landscape one’s eye takes in everything except the human beings. It takes in the dried-up soil, the prickly pear, the palm-tree and the distant mountain, but it
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