Mainland Thai culture is heavily influenced by Buddhism. Thailand's Buddhists follow the Theravada school, which is arguably closer to its Indian roots and places a heavier emphasis on monasticism. One pre-Buddhist tradition that still survives is the spirit house, usually found at the corner of any house or business, which houses spirits so they don't enter the house and cause trouble. Some traditional arts popular in Thailand include traditional Thai dancing and music, based on religious rituals and court entertainment. Famously brutal Thai boxing, derived from the military training of Thai warriors, is undoubtedly the country's best known indigenous sport. In addition to the mainland Thai culture, there are many other cultures in Thailand including those of the “hill tribes” in the northern mountainous regions of Thailand, the southern Muslims, and indigenous island peoples of the Andaman Sea.