Before an attempt is made on the concept of Nyishi custom of worshipping nature through puja or festivals like Nyoyin-Nyokum; it is necessary to focus on the religious belief of the Nishing (Nyishi). The Nyishi, who dwell in nature, believe in numerous Uyus (deities). This belief centres on spirits or deities of nature. All the performances of customary rites of Nyishi more or less relate to natural objects in Siichii and Nyedo i.e. earth and sky.