This document discusses different approaches to envisioning and designing potential futures, including speculative design, design fiction, and considering how the past and present influence possible futures. It explores ideas like plausible and possible futures, using fiction to suspend disbelief about change, and examining alternate presents or lost futures through a speculative lens. The core message is that design can be used to seriously consider and get people to concentrate on potential objects, services, and worlds rather than entire strategies, in order to envision "what if" scenarios about the future.