Celtic Tree of Life design, by the Yggdrasil Tree of Norse mythology, creating a harmonious and zen design that celebrates Viking and Celtic religion. This Tree of Life Viking design is a great idea for Mother's Day, Father's Day Phases of the Moon Retro Yggdrasil Tree of Life for Men and Women's Celtic Tree of Life design, inspied by Yggdrasil, the sacred ash tree of Norse mythology. Harmonious Tees with a Tree of Life Viking design, Nordic knotwork art and Celtic knotwork art of the Phases of the Moon Lightweight, Classic fit, Double-needle sleeve and bottom hem