This thesis presents a study of transcendent experiences — experiences of connection with something greater than oneself — focusing on what they are, how artefacts support them, and how design can contribute to that support. People often find such experiences transformative, and artefacts do support them — but the literature rarely addresses designing artefact support for TXs. This thesis provides a step toward filling that gap. The first phase of research involved the conduct and analysis of 24 interviews with adults (...) of diverse spiritual perspectives, using constructivist Grounded Theory methods informed by relevant literature and by studies performed earlier in the PhD programme. Analysis found that TXs proceed in three phases — creating the context, living the experience, integrating the experience — and that artefacts support two phases and people desire enhancements to all three. This TX framework supports and extends experience structures from the literature: it recognises the top-level categories as phases in a cycle where integration may alter future contexts, and it extends the structure of TX by incorporating the relationships of artefacts and of enhancement desires to the phases of these experiences. This extended structure constitutes a grounded theory of transcendent user experience. The second phase involved the design and conduct of three “Transcendhance” game workshops for enhancing transcendence, which incorporated themes from the grounded theory and aimed to elicit design ideas in an atmosphere of imagination, fun, and play. Participants sketched 69 speculative ideas for techno-spiritual artefacts, and analysis mapped them to TX phases and identified possible extensions inspired by relevant research. The great majority of ideas mapped to the phase Creating the Context, with very few mapping to Living the Experience, which suggests that context may be easier than lived experience to understand and address directly. This point is especially important for experiences such as TX that are tricky to define, impossible to arrange or anticipate, and thus unsuitable for straight-forward “classic” user experience methods. The final phase involved the elaboration of workshop ideas to explore the extension of design fiction for TUX. Analysis related design fiction to the TX phases and suggested features that affect design ideas’ potential for TUX design fiction. This phase ended with the proposal and analysis of three new forms of design fiction — extended imaginary abstracts, comparative imaginary abstracts, and design poetry — using workshop ideas to illustrate the forms, their construction and use, and their benefits to TUX design. Transcendhance workshops and TUX design fictions approach techno-spiritual design peripherally, “sneaking up” on lived experience by addressing context and enabling the consideration of ineffable experience through storytelling, metaphors, and oblique imagery. This thesis combines the grounded theory of transcendent user experience with the Transcendhance workshop process and new forms of design fiction, presenting peripheral design as a promising strategy for facilitating design to enhance transcendent experience. (shrink)