Norse Celtic Mythology design. Yggdrasil Norse Tree Of Life, Viking, Celtic Moon Phases for men and Women. Beautiful Illustration of Yggdrasil the Norse and Celtic tree of life surrounded by the phases of the moon. Beautiful Illustration of Yggdrasil the Norse and Celtic tree of life surrounded by the phases of the moon. Celtic Knot Style Viking Norse design Lightweight, Classic fit, Double-needle sleeve and bottom hem