Ideas gain legitimacy as they are put to some practical use. A study of Charles Sanders Peirce (1839-1914) supports this pragmatism as a way of thinking about truth and meaning. Architecture has a strong pragmatic strand, not least as we think of building users, architecture as a practice, the practical demands of building, and utility. After all, Vitruvius placed firmness and delight in the company of utilitas amongst his demands on architecture...