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**Upper arm tattoo design, semi-realistic style. A detailed nautilus shell as the central element, symbolizing the golden ratio and Fibonacci sequence, surrounded by elegant mathematical elements--geometric shapes (triangles, circles, spirals), fractals, number sequences, and fine line graphs. Incorporate subtle overlays of mathematical formulas (like Euler’s identity, Pi, and the golden ratio φ), abstract logic circuit patterns or sacred geometry. Intricate fine linework, black and grey ink with subtle hints of gold or violet, vertical layout for upper arm, balance of organic forms and precise geometry, tattoo sketch style --v 6.0 --ar 2:3 --raw** - <@146051115195039746> (fast)