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names might be used in this Celtic cosmogenesis and the Dagda stand for Lir, Boan for Dana, Fintan for Mananan, and others again might be interchangeable with these. Even as the generations follow one another in time, each looking upon the same unchanging nature as the ancestors but naming it by other names, so in antiquity races were invaded by others who came with a cosmogony the same in all essentials, but for differences of language and name, as that of the people invaded. After centuries there comes a blending of cultures and a subsidence into legend, bringing about a bewildering mosaic of mythology. The unity of primeval vision is broken up in the prism of literature. Deities grow in number in the popular imagination and coexist there, who in truth, if their spiritual ancestry was known, were but varying names for one divine being.