An ubosot stands within a boundary formed by eight boundary stones (Thai: ใบเสมา) which separate the sacred from the profane, and thus differs from a wihan (วิหาร). The sema stones actually stand above and mark the luk nimit (Thai: ลูกนิมิต), stone spheres buried at the cardinal points of the compass delineating the sacred area. A ninth stone sphere, usually bigger, is buried below the main Buddha image of the ubosot. Both ubosots and viharns typically house Buddha images. The entrance side of most ubosots face east. Across from the entrance door at the end of the interior is the ubosot's largest Buddha statue