As a result of development toward ‘smart’ materials, materials now enable an expanding range of aesthetic expressions and user experiences. These materials are fundamentally temporal in their capacity to assume multiple, discrete states of expression that can be repeatedly and minutely controlled. These materials come to be, or become, only over time and in context—they are becoming materials. Thus, in the development and application of such materials, we must engage more extensively with the experience of materials in practices of design and of use. This paper introduces and discusses the concept of becoming materials—as well as the implications for practice—through a series of examples from our own practice-led research within art, design and architecture. Coming to terms with the implications for material practices of design and of use, we suggest, requires the development of new concepts and methods for doing and studying the design of becoming materials.

In Interaction Design, we are presented with an opportunity to return to the designed object as a subject of enquiry with a new perspective. We suggest a reconsideration of form as the starting point for developing a deep understanding of computational things and an approach to dealing with their inherent complexity. Understanding the object as composed of both spatial and temporal form, we can use materials to design a 'surface' for experience that extends beyond the three-dimensional object. Presenting both theoretical considerations and design examples, we discuss the potentials of a new perspective on form as a basis for design research and education.