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Speculative and fictional approaches have long been implemented in human-computer interaction and design techniques through scenarios, prototypes, forecasting, and envisionments. Recently, speculative and critical design approaches have reflectively explored and questioned possible, and preferable futures in HCI research. We propose a complementary concept -material speculationthat utilizes actual and situated design artifacts in the everyday as a site of critical inquiry. We see the literary theory of possible worlds and the related concept of the counterfactual as informative to this work. We present five examples of interaction design artifacts that can be viewed as material speculations. We conclude with a discussion of characteristics of material speculations and their implications for future design-oriented research.

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In this paper, we argue for framing the crafting and studying of research products as doing philosophy through things. We do this by creating an annotated portfolio of such Research through Design (RtD) artifact inquiries as postphenomenological inquiries. In our annotated portfolio, we first provide an account of the postphenomenological commitments of 1) taking empirical work as the basis of the inquiry, 2) analyzing structures of human-technology relations and 3) studying technological mediation. Secondly, we trace these commitments across six RtD artifact inquiries. We conclude with a discussion on how research products can be seen as an experimental way of doing postphenomenology and how HCI design researchers can work with that. As a result, the presented philosophical framing can be leveraged in HCI research to form a deeper and more dimensional understanding of the human-technology relations we craft and study. This also adds a methodological path to moving beyond foci of use, utility, interaction, and human-centeredness.

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