作品 7：古今车架对比速写 (Historical

作品 7：古今车架对比速写 (Historical vs. Modern Sketch) * Prompt: > Split-screen comparative analytical architectural sketch: left side showing a detailed 19th-century Victorian wrought-iron bicycle frame design with vintage metallurgical callouts, right side showing a modern minimalist topology-optimized carbon fiber dirt bike frame, fine line-art drawing style, antique paper texture blending into modern clean digital paper --ar 16:9 --v 6.0