celtic knotwork and tree of life border silhouette ornament

celtic architecture border knotwork tree life silhouette intricate symmetry interwoven patterns vector cultural bold lines design ornamental traditional heritage black art classic decorative irish scottish tribal ancient symbolism celtic-art historic mythology celtic-knot folklore spiritual celtic-symbols detailed bold-design celtic-inspired heritage-art tree- -life mythology-art decorative-border artistic classicism vintage tribal-pattern celtic-heritage cultural-art decorative-motif traditional-symbol knot-pattern ancient-culture symmetrical aesthetic timeless outline ancient-symbols historical spirituality european decorative-design folklore-symbol knot-motif vintage-inspired tree-symbol ancient-motif decorative-knot intricate-art historic-design tribal-symbol spiritual-symbol celtic-history ancestral irish-culture