知识阶梯：穿越时空的书之螺旋

Top-down bird's-eye view of a spiral staircase, each step is a single book, ancient illuminated manuscripts and scrolls at the base transitioning to modern picture books and academic textbooks near the top, repetitive circular ascending pattern, three caricatured figures climbing: a Renaissance polymath at the lowest steps, an Edo-period Japanese inventor midway, a contemporary youth at the top gazing downward, flat minimal line illustration with few strokes, monochrome composition with bold spot color accents on the human figures only, pop art graphic style, clean simple layout, ascent of human knowledge across time, surreal overhead perspective