In times past, when people wandered the world on foot, rode on horseback, or sailed in ships, the journey itself accustomed them to the change. Images of the earth passed ever so slowly before their eyes, the stage revolved in a barely perceptible way. The voyage lasted weeks, months. The traveler had time to grow used to another environment, a different landscape. The climate, too, changed gradually. Before the traveler arrived from a cool Europe to the burning Equator, he already had left behind the pleasant warmth of Las Palmas, the heat of Al-Mahara, and the hell of the Cape Verde Islands.
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