Guitare à colorier style art nouveau aux nœuds celtiques

Black-and-white coloring page illustration of: celtic knots intricate. Audience: adults (relaxation), detailed detail, art nouveau drawing style. Pure black outlines on white background, no shading, no fill, no grayscale, no gradient. Closed shapes ready for crayon / marker. Clean printable line-art at high contrast, no watermarks. Wholesome family-friendly imagery only. No graphic content, no scary or violent themes for kids audiences. Specifically: celtic knots intricate. Target search intent (rendered visually, no on-image text): "guitare à colorier" (fr).