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Furniture is bought by imagining it at home. A chair on white tells the shopper its shape; the same chair beside a window with a rug and a lamp tells them how big it is and how it would feel in their room. Most furniture listings need both.
It's also the most physical category to shoot. Pieces are heavy, rooms have to be built or rented, and every colourway of a sofa means moving another sofa. Many brands end up with white packshots only, which leaves shoppers guessing about scale.