Buildings should also be built of materials that can resist the deteriorating effects of the weather, but that is another story.
The present-day city is surrounded by square stone walls built of materials from the ruined ancient city.
The most common type of house in the city is the kampong, or village, house; most such houses are built of materials such as wood or bamboo mats, but this does not necessarily mean that they are substandard.
One day there will be nothing there, the next day there will be houses," she says, pointing out a shanty town built of materials scavenged by desperately poor workers arriving from all over Mexico seeking jobs in the city's maquiladoras, or factories.
To guard against this, in 1538, he began to build a chain of expensive, state-of-the-art defences, along Britain's southern and eastern coasts from Kent to Cornwall, largely built of material gained from the demolition of the monasteries.
Like all secular buildings of Angkor, these were built of perishable materials rather than of stone, so nothing remains of them except the outlines of some of the streets.
Much in our man-made structures is built of natural materials, and it must be remembered that these materials have natural colours and textures that usually are superior to anything man can create artificially.
Initially the slums were characterized by shelters built of scrap materials and by crowded, unsanitary conditions.
Nevertheless, at 308 pounds, it represents the lightest auto body yet built of polymeric materials.
Moreover, the show was pleasing to the eye, built of humble materials on simple yet sophisticated lines.
