A contemporary public library harvests rainwater in a steep green mountain valley after rainfall. Arrange stepped rammed-earth walls, timber reading halls and deep roofs along the natural contour; connect visible rain chains to planted cistern courtyards, stone channels and a reflective collection pond. Photograph the complex from an elevated three-quarter viewpoint across the valley with a horizontal 4:3 frame and a 28mm architectural lens. Include wet stone paths, native ferns, a narrow stream, lifting mist and tiny visitors for scale, with warm reading-room lights against soft post-rain daylight. Use believable construction, weathered timber, moss green, wet earth and muted brass. Keep every drainage path coherent. No impossible cantilevers, generic glass tower, landmark imitation, readable signs, logos or watermark.