Black-ink engraving in the style of a 19th-century newspaper etching, dense fine cross-hatching and line shading, no soft gradients of a long workbench of sealed blueprint tubes and rubber stamps beside a stack of inked patent certificates, smartphone parts scattered in soft light, limited palette of near-black ink and golden yellow on plain white (the only colour besides black is golden yellow), bold simple silhouettes, generous empty space, magazine infographic style, no text, no letters, no numbers, no border