Ovambo families in northern Namibia traditionally build a house for each child, using wooden poles placed close together to build the circular walls. But now that the region is running short of trees enterprising people in the area are turning to a more readily available building material: the empty beer bottles that litter the roadsides and are available cheap from local shops.

("New Scientist", September 24, 1994).

De acordo, com o texto, no norte da Namíbia: