In the sheltered coastal waters of the Bohai Sea, the Yellow Sea, the East China Sea and the South China Sea, there are large fish farms where marine crustaceans such as shrimps, and molluscs such as oysters, are raised in artificial enclosures. These farms are created by floating netted enclosures from a sprawling network of interconnected wooden pathways and platforms. Over these, fishermen have built wooden houses and huts where entire families live.
Crisscrossing the highland plains in western Bolivia is a network of thousands of near perfectly straight lines etched into the ground. These lines do not make any figures or shapes, but they go on remarkably straight for tens of kilometers. Whoever created them worked extremely precisely, which was not easy task in this hilly terrain with rocks, shrubs and other natural obstacles.