Tangible user interfaces (TUIs) augment the physical world by integrating digital information with everyday physical objects. Developing tangible interfaces is challenging because programmers are responsible for acquiring and abstracting physical input. Scott Clemmer discusses the creation of Papier-Mâché, a toolkit for building tangible interfaces using computer vision, electronic tags, and barcodes. Papier-Mâché introduces high-level abstractions for working with these technologies that facilitate technology portability. From the Series:CSE Colloquia - 2004