"A cohesive and striking abstract tattoo design on a realistic forearm in natural skin tone, featuring a cosmic time theme with bold, thick black and grey lines. The design includes large, solid concentric circles and spirals representing the infinite passage of time, covering a significant portion of the forearm. Integrate geometric patterns like triangles, hexagons, and stars seamlessly into the design, branching off from a central timeline with strong, continuous lines and smooth fades to create depth. Incorporate an abstract sun and moon with flowing black and grey shading that blends harmoniously into the surrounding elements. A powerful cosmic wave should flow through the composition, unifying the design with dynamic shapes and smooth transitions, all in black and grey ink. The tattoo is depicted on a forearm with natural skin tone, showcasing the contrast and detail."