This piece presents a hyper-detailed biomechanical coil study etched in black and grey on the forearm. A dominant coil spring anchors the composition, surrounded by gears, cogs, screws, shafts, pistons, and other machine parts, all rendered with high-contrast shading to mimic brushed steel and chrome. The design fuses anatomy with engine architecture, guiding the eye along the spiral of the spring while the surrounding hardware forms an interlocking network that feels both organic and engineered. Bold contour lines establish the overall silhouette, mid-tones sculpt the curved surfaces of the coil and gears, and fine stippling adds texture to gear teeth, spline joints, and fasteners, creating a tactile, photorealistic impression on skin. The interplay of light and shadow emphasizes metallic reflection and deep blacks, producing a durable, high-contrast tattoo design that remains legible across sizes, making it a strong option for cover-up work where prior ink is dense or faded. Symbolically, gears imply cycles, momentum, and precision; the coil embodies resilience and renewal, and the mechanical motif nods to craft, problem-solving, and transformation—themes common to meaningful tattoos and contemporary body art. From a practical perspective, this is a bold, large-scale design suited to the forearm or as the focal point of a sleeve, with the black and grey palette ensuring timeless appeal and versatile placement. As an AI-generated tattoo project, it demonstrates how digital concepts can inform traditional tattoo design, offering a sophisticated blueprint that a tattoo artist can adapt while preserving the mechanical drama, crisp line-work, and metallic finish that characterize high-end realism in black and grey ink. For clients seeking a cover-up that is both pattern-rich and statement-making, this piece delivers robust coverage, graphic impact, and lasting ink.