In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.

Houses in rural Ratanakiri are made from bamboo, rattan, wood, saek, and kanma leaves, all of which are collected from nearby forests; they typically last for around three years. Village spatial organization varies by ethnic group. Kreung villages are constructed in a circular manner, with houses facing inwards toward a central meeting house. In Jarai villages, vast longhouses are inhabited by all extended families, with the inner house divided into smaller compartments. Tampuan villages may follow either pattern.Nearly all Khmer Loeu are animist, and their cosmologies are intertwined with the natural world. Some forests are believed to be inhabited by local spirits, and local taboos forbid cutting in those areas. Within spirit forests, certain natural features such as rock formations, waterfalls, pools, and vegetation are sacred. Major sacrificial festivals in Ratanakiri occur during March and April, when fields are selected and prepared for the new planting season. Christian missionaries are present in the province, and some Khmer Loeu have converted to Christianity. The region's ethnic Khmer are Buddhist. There is also a small Muslim community, consisting mainly of ethnic Cham.Because of the province's high prevalence of malaria and its distance from regional centers, Ratanakiri was isolated from Western influences until the late 20th century. Major cultural shifts have occurred in recent years however, particularly in villages near roads and district towns; these changes have been attributed to contact with internal immigrants, government officials, and NGO workers. Clothing and diets are becoming more standardized, and traditional music is being displaced by Khmer music. Many villagers have also observed a loss of respect for elders and a growing divide between the young and the old. Young people have begun to refuse to abide by traditional rules and have stopped believing in spirits.
What types of housing are used by Tampuan villages?