Dutch design studio Os ∆ Oos
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Sketches for the new edition of the Keystone chair, with upholstery swatches by Raf Simons for Kvadrat fabrics. “Kvadrat has thousands of colors. When you give the product to a client, they can never choose, so we try to make a selection," notes Mensen, finding that three colors for each segment of the chair are enough in terms of options.