North Africa, North America, and South America, the worship of these stones, or the use of these stones to symbolize a spirit or deity, is a possibility. In the early 20th century, some scholars believed that all megaliths belonged to one global "Megalithic culture" (hyperdiffusionism, e. g. "the Manchester school", by Grafton Elliot Smith and William James Perry), but this has long been disproved by modern dating methods. Nor is it believed any longer that there was a pan-European megalithic culture, although regional cultures existed, even within such small areas as the British Isles. The archaeologist Euan Mackie wrote, "Likewise it cannot be doubted that important regional cultures existed in the Neolithic period and can be defined by different kinds of stone circles and local pottery styles (Ruggles & Barclay 2000: figure 1). No-one has ever been rash enough to claim a nationwide unity of all aspects of Neolithic archaeology!". Methods of construction Much scholarship over history has suggested that Stone Age peoples moved the large stones on cylindrical wooden rollers. However, there is some disagreement with this theory, specifically as experiments have indicated that this method is impractical on uneven ground. In some contemporary megalith building cultures, such as in Sumba, Indonesia, great emphasis is placed on the social status of moving heavy stones without the relief of rollers. In the majority of documented contemporary megalithic-building communities, the stones have been placed on timber sledges and dragged without rollers. Types of megalithic structure The types of megalithic structure can be divided into two categories, the "polylithic type" and the "monolithic type". Different megalithic structures include: Contemporary megalith-building cultures The Toraja of Indonesia The megalithic culture of the Toraja people in the mountainous region of South Sulawesi, Indonesia dates back to around 2500–1000 BC. The Marapu of Indonesia In West Sumba, Indonesia, the more than 20,000 followers of the Marapu animist religion construct monolithic tombs by hand. Originally built with slave labor, the large tombs of nobles are now built by a class of dependents who are paid either in animals or cash (an amount equal to $0.65–0.90 per day). The tombs are planned long in advance, with families sometimes going into extreme debt to finance the construction. In 1971, one leading family sacrificed 350 buffalo over the course of a year in order to feed the 1,000 people necessary to drag the capstone 3 km from the quarry to