The term describes an unrealistic or fanciful aspiration, something highly improbable or purely imaginary. It evokes a vision of something desirable but fundamentally unattainable, much like expecting to find a literal pie in the heavens. For example, suggesting a self-sustaining colony on a distant, resource-poor planet with current technology could be seen as offering such a scenario.
Its significance lies in the realm of strategic planning and critical assessment. Recognizing the difference between achievable goals and improbable fantasies is vital for effective resource allocation and preventing wasted effort. Historically, this concept has served as a cautionary reminder against overly optimistic projections and the pursuit of endeavors lacking a solid foundation in reality or feasibility.