"A unified and elegant abstract tattoo design on a realistic forearm in natural skin tone, embodying a cosmic time theme. The tattoo should feature bold, thick black and grey elements that create a seamless and cohesive composition. Incorporate large concentric circles and spirals that flow naturally across the forearm, integrating geometric patterns like triangles, hexagons, and stars in a way that enhances the overall harmony of the design. Emphasize a smooth, interconnected look where all elements blend effortlessly into each other. The abstract sun and moon should be part of this integrated design, with fluid shading that complements and unifies the entire tattoo. Ensure the overall appearance is clean and sophisticated, with the black and grey ink forming a striking contrast against the natural skin tone of the forearm."