Āyatana (Pāli; Sanskrit) is the Buddhist term for a "sense base" or "sense sphere." In Buddhism, there are six internal sense bases (Pali: ajjhattikāni āyatanāni; also known as, "organs", "gates", "doors", "powers" or "roots") and six external sense bases (bāhirāni āyatanāni or "sense objects"; also known as vishaya or "domains"). Thus, there are twelve sense bases in...