Celtic Tree of Life with Knotwork Roots Wood CarvingCeltic Tree of Life with Knotwork Roots Wood Carving. Celebrate your family with one of our Tree of Life carvings ~ the roots represent your ancestors, you and your living relatives are the trunk and the branches are future generations to come. Sometime known as the Tree of Knowledge or Sacred Tree, the Tree of Life is seen as a connection between the heavens and the underworld. It is part of Celtic and Viking traditions. In Viking lores, it is called