World Book Day: Universe in a Book AI Image Prompt

World Book Day themed poster, vertical half-open poster, high-end dreamy creative illustration style, a thick book opens in the center of the frame, from which a miniature yet vast world grows, containing campus buildings, knowledge tree, running youth, easel, musical notes, sports field, mountains and rivers, city, starry sky, birds, warm light beams, labor practice and other elements. All elements naturally extend from the pages, forming the grand imagery of reading opening up the world. The overall composition is centered and layered, with strong visual impact. Color palette: cream white, verdant green, lake blue, warm gold. Spring atmosphere, clean and bright, strong sense of book fragrance, clear air, exquisite details, strong artistic feel, with both campus culture and public service poster qualities, modern design sense, suitable for later typography and title text. No brand logo, no watermark, no erroneous text, clean image, print poster quality, beautiful, healing, imaginative.