I don't normally include PhD dissertations in the bibliography, but this is an exceptional case (and it is freely available in final form). Larsen reports on a major participatory design project with multiple sites practicing the Snoezelen approach for children with profound disabilities, where he manages to provide significant academic contributions to three separate areas: the aesthetics of tangible interaction, the development of design and pedagogy for the particular field, and the methodology of design research. Moreover, he addresses a recurring issue in participatory design to do with the role of the designer in collaborative processes. Available for free download from http://www.lu.se/lup/publication/5265731