Over the past few years, a quiet revolution has been redefining our fundamental computing technologies. Flexible E-Ink, OLED displays, shape-changing materials, parametric design, e-textiles, sensor networks, and intelligent interfaces promise to spawn entirely new user experiences that will redefine our relationship with technology. This workshop invites researchers and practitioners to imagine and debate this future, exploring two converging themes. Transitive Materials focuses on how emerging materials and computationally-driven behaviors can operate in unison blurring the boundaries between form and function, human body and environment, structures and membranes. Organic User Interfaces (OUI) explores future interactive designs and applications as these materials become commonplace. Keywords Interaction design, architecture, smart materials, tangible UI, ubiquitous computing, organic UI, physical interaction, transitive materials, shape change, flexible computers, interactive texti...