Ijaw religious beliefs hold that water spirits are like humans in having personal strengths and shortcomings, and that humans dwell among the water spirits before being born. The role of prayer in the traditional Ijaw system of belief is to maintain the living in the good graces of the water spirits among whom they dwelt before being born into this world, and each year the Ijaw hold celebrations in honor the spirits lasting for several days. Central to the festivities is the role of masquerades, in which men wearing elaborate outfits and carved masks dance to the beat of drums and manifest the influence of the water spirits through the quality and intensity of their dancing. Particularly spectacular masqueraders are taken to actually be in the possession of the particular spirits on whose behalf they are dancing.