These sources discuss Celtic and Norse art and symbolism, specifically focusing on their appearance in tattoos. Some texts explain the historical context and meaning of various symbols like the Triskelion or Valknut, linking them to ancient beliefs about strength, life, and spirituality. Other sources examine the evidence for ancient tattooing practices within these cultures, acknowledging the debate surrounding their extent and methods. Additionally, the materials highlight modern tattoo studios that specialize in Celtic and Nordic designs, demonstrating the continued relevance and artistic evolution of these ancient motifs in contemporary body art.