Belief in spirits (phii) is deeply woven into Thai culture alongside Buddhism — not as a contradiction but as a layered spiritual worldview that acknowledges multiple levels of unseen reality. The most visible manifestation is the spirit house (san phra phum), a miniature ornate house on a pedestal found outside virtually every Thai building — homes, hotels, offices, shopping malls, even 7-Eleven stores. The spirit house is a home for the protective spirit of the land (Phra Phum Chao Thi), and offerings of flowers, incense, food, and water are regularly placed to maintain the spirit's goodwill. Moving or neglecting a spirit house is considered very bad luck. Ghost stories (reuang phii) are a cornerstone of Thai popular culture — Thai horror films (Mae Nak Phrakanong, Shutter, Buppah Rahtree) regularly top box office charts and draw on a deep tradition of specific named spirits. The most culturally significant: Phi Phop (a malevolent spirit inhabiting living bodies), Mae Nak (ghost of a pregnant woman who died and refuses to leave her husband), and Pi Krasue (a floating female head with dangling internal organs — a deeply terrifying image in Thai folklore). The Ghost Festival (Phi Ta Khon) in Dan Sai, Loei province, in June–July is a three-day celebration where villagers wear terrifying handmade masks and ghost costumes — one of Thailand's most extraordinary regional festivals. Taking photographs of spirit houses respectfully is fine; pointing at or mocking spirit houses is deeply offensive.
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