Birth, life, death and rebirth are all part of eternal cycle. All is connected the same way a tree is connected to its environment. Our ancestors were well aware of this fact and they often featured a Tree of Life in their artwork.
In our beautiful and detailed design the young branches, buds, green grass and a clover symbolize birth and youth. The acorn depicts adulthood while the autumn and winter of one's life is portrayed as ice and a skull.
Vikings and Celts were not afraid of death and they even displayed skulls in their homes.