In his description of the textile enclosure, specifically drapery, Semper suggests that it should “fit the organism snugly, highlight its properties, and veil and correct the flaws and irresolutions of its form.3” Rietveld’s infamous Red and Blue Chair (figure 3), a key feature of the Schroder house, translated Semper’s principle almost perfectly. He designed the chair to keep the sitter physically and mentally active. Rietveld was often quoted saying, “We must remember that ‘sit’ is a verb, too.4” As depicted in the image of Rietveld sitting in an earlier version of the chair, the chair clearly delineates a specific posture for the user (figure 4). With no padding on the chair, the entire seat is angled to prevent users from sliding out and provide support to the head and neck5. Much like the folds of a drape in relation to the furnishings of a space, of particular importance to Semper, Rietveld paid special attention to the ergonomics of his furnishings.
Colombo developed Semper’s distinction between the enclosed and the enclosure slightly differently. For Colombo, the Total Furnishing Unit, aimed to “more closely approximate the actual life style of today and tomorrow,6” but is also “closer to man’s true requirements and less restricting and representative of taste, prestige, and so forth.” Rather than investigating the way the enclosure could reflect the enclosed, he was interested in how the enclosed, human beings, could shape the enclosure. Aligning more with Semper’s idea that the “enclosed should present itself unmistakably as the principle theme and be placed upon a suitably chosen background7,” the Total Furnishing Unity,