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The Rice Terraces of the Philippine Cordilleras, a 10,360-square-kilometer (4,000В sqВ mi) sprawling agricultural landscape carved in the mountains by free tribesmen of Ifugao some 6,000 to 2,000 years ago.

The Great Wall of China is a human-built megastructure, a few meters wide and 3,947 miles (6,352В km) in length, about 4,975,318 square yards (4,160,000В m 2).

There are structures that may be considered megastructures, such as

4.3 Star Wars (1979 вЂ“ Present, American sci-fi franchise).

Some of the more notable such architects and architectural groups include the Metabolist Movement, Archigram, Cedric Price, Frei Otto, Constant Nieuwenhuys, Yona Friedman, and Buckminster Fuller. Many architects have designed such megastructures. Other sources define a megastructure as 'any development in which residential densities are able to support services and facilities essential for the development to become a self-contained community'. This type of framework allows the structure to adapt to the individual wishes of its residents, even as those wishes change with time. In 1968, Ralph Wilcoxen defined a megastructure as any structural framework into which rooms, houses, or other small buildings can later be installed, uninstalled, and replaced and which is capable of 'unlimited' extension. Megastructures often play a part in the plot or setting of science fiction movies and books, such as Rendezvous with Rama by Arthur C. Such arcology concepts are popular in science fiction. Megastructures are also an architectural concept popularized in the 1960s where a city could be encased in a single building, or a relatively small number of buildings interconnected. Those that could be constructed easily qualify as megaprojects. This makes their design examples of speculative (or exploratory) engineering. Most megastructure designs could not be constructed with today's level of industrial technology. The lower bound of megastructural engineering might be considered any structure that has any single dimension 1 megameter (1000В km) in length. The products of megascale engineering or astroengineering are megastructures. Some sources define a megastructure as an enormous self-supporting artificial construct. Some apply the term to any especially large or tall building. This picture was taken near Beijing in February 2005.ДЄ megastructure is a very large artificial object, although the limits of precisely how large vary considerably. The Great Wall of China, at 6,352В km or 3,947В mi long, is a megastructure.