Speculative Enactments are a novel approach to speculative design research with participants. They invite the empirical analysis of participants acting amidst speculative but consequential circumstances. HCI as a broadly pragmatic, experience-centered, and participant-focused field is well placed to innovate methods that invite first-hand interaction and experience with speculative design projects. We discuss three case studies of this approach in practice, based on our own work: Runner Spotters, Metadating and a Quantified Wedding. In distinguishing Speculative Enactments we offer not just practical guidelines, but a set of conceptual resources for researchers and practitioners to critique the different contributions that speculative approaches can make to HCI discourse.

Design and HCI researchers are increasingly working with complex digital infrastructures, such as cryptocurrencies, distributed ledgers and smart contracts. These technologies will have a profound impact on digital systems and their audiences. However, given their emergent nature and technical complexity, involving non-specialists in the design of applications that employ these technologies is challenging. In this paper, we discuss these challenges and present GeoCoin, a location-based platform for embodied learning and speculative ideating with smart contracts. In collaborative workshops with GeoCoin, participants engaged with location-based smart contracts, using the platform to explore digital 'debit' and 'credit' zones in the city. These exercises led to the design of diverse distributed-ledger applications, for time-limited financial unions, participatory budgeting, and humanitarian aid. These results contribute to the HCI community by demonstrating how an experiential prototype can support understanding of the complexities behind new digital infrastructures and facilitate participant engagement in ideation and design processes.

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This paper describes three interactive artefacts created for a children's exhibition intended to encourage creativity and allow educational opportunities to emerge naturally through playful exploration. We describe five sensibilities that were used to inform our designs: considering artefacts as resources and scaffolds for imaginative engagement, rewarding extended investment, facilitating requisite unpredictability, encouraging an imaginative orientation to participation, and permitting multiple loci for interaction. Based on observation of how our interactives were used by the public, we discuss how our approach facilitated 'open interactions' in a manner that was sensitive to the museum context, favoured a mix of materialities, and manifested a subtle mix of participation and designer autonomy.

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This paper explores a design-led approach to digital fabrication which situates it in participatory data translation activities to demonstrate that this technology can find application beyond its use as tool for manufacture. We present two contrasting design contexts in which, respectively, data from conference twitter conversations and craft practitioners' movements are translated into interactively generated and fabricated physical artefacts. We argue that direct involvement in such digital fabrication activities can help people invest meaning into artefacts and facilitate social interaction and reflection upon their activities, while encouraging practitioners to incorporate new forms into their own work. On this basis, we reconsider digital fabrication within data translation activities as situated along an extended 'trajectory of use' in which reflective, meaningful 'data-things' can be created.

We introduce Metadating-a future-focused research and speed-dating event where single participants were invited to 'explore the romance of personal data'. Participants created 'data profiles' about themselves, and used these to 'date' other participants. In the rich context of dating, we study how personal data is used conversationally to communicate and illustrate identity. We note the manner in which participants carefully curated their profiles, expressing ambiguity before detail, illustration before accuracy. Our findings proposition a set of data services and features, each concerned with representing and curating data in new ways, beyond a focus on purely rational or analytic relationships with a quantified self. Through this, we build on emerging interest in 'lived informatics' and raise questions about the experience and social reality of a 'data-driven life'.

New digital technologies such as Blockchain and smart contracting are rapidly changing the face of value exchange, and present exciting new opportunities for designers. This one-day workshop will explore the implications of emerging and future technologies using the lens of Distributed Autonomous Organisations (DAOs). DAOs introduce the principle that products and services may soon be owned and managed collectively and not by one person or authority, thus challenging traditional concepts of user communities, ownership and power. The HCI community has recently explored issues related to finance, money and collaborative practice; however, the implications of these emerging but rapidly ascending distributed organisations has not been examined. This one-day participatory workshop will combine presentations, case studies and group work sessions to understand, develop and critique these new forms of distributed power and ownership, and to practically explore how to design interactive products and services which enable, challenge or disrupt these emerging models.