The tombstone of the twentieth-century Swiss mystic and Catholic convert Dr. Adrienne von Speyr features a three-dimensional monolithic stone carving resembling the bas-relief two-dimensional carved eternal-knot symbol of Norse mythology, the valknut, used to eulogize legendary valor surpassing human understanding. The mysterious beauty of three-fold symmetry is evident in even more ancient forms of the Triskelion such as the spinning three-legged flag of Sicily with its pre-Byzantine roots in Greek culture and the carved lozenge near the main entrance of the prehistoric Newgrange monument in County Meath, Ireland, with its characteristic iron-age Celtic swirl using the spatial-motion symmetry of an Archimedean spiral from around 3200 BCE.