The great existential challenges facing the human species can be traced, in part, to the fact that we have underdeveloped discursive practices for thinking possible worlds ‘out loud’, performatively and materially, in the register of experience. That needs to change. In this dissertation, a methodology for ‘experiential scenarios’, covering a range of interventions and media from immersive performance to stand-alone ‘artifacts from the future’, is offered as a partial corrective. The beginnings of aesthetic, political and ethical frameworks for ‘experiential futures’ are proposed, drawing on alternative futures methodology, the emerging anti- mediumist practice of ‘experience design’, and the theoretical perspective of a Rancièrian ‘politics of aesthetics’. The relationships between these three domains -- futures, design, and politics -- are explored to show how and why they are coming together, and what each has to offer the others. The upshot is that our apparent binary choice between unthinkable dystopia and unimaginable utopia is a false dilemma, because in fact, we can and should imagine ‘possibility space’ hyperdimensionally, and seek to flesh out worlds hitherto supposed unimaginable or unthinkable on a daily basis. Developed from early deployments across a range of settings in everyday life, from urban guerrilla-style activism to corporate consulting, experiential scenarios do not offer definitive answers as to how the future will look, or even how it should look, but they can contribute to a mental ecology within which these questions may be posed and discussed more effectively than ever before.