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A close-up photo of a well-worn blue book titled 'Rockwool in Horticulture' by Denis L. Smith, featuring four black-and-white photos on the cover: plants in rockwool pots, rows of rockwool slabs in a greenhouse, a Commodore CBM computer, and a close-up of rockwool. The book rests on a wooden surface, with the photographer's feet in dark socks and pants visible at the bottom of the frame. The humor comes from the juxtaposition of the book's serious, technical subject matter with the casual, everyday context of someone casually holding or standing near it.

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