Cool, precise diagrammatic flat illustration with clean geometric shapes and thin ruled lines, like an architectural drawing of a row of empty glass-walled office floors and a data center aisle seen at dusk, a single set of keys on a desk, limited palette of near-black ink and cobalt blue on plain white (the only colour besides black is cobalt blue), bold simple silhouettes, generous empty space, magazine infographic style, no text, no letters, no numbers, no border