The expression describes ideas or plans that are highly improbable or unrealistic. These concepts, while perhaps appealing in theory, are unlikely to ever materialize in practice due to a variety of practical constraints or a fundamental disconnect from reality. For example, envisioning a business model predicated on instantaneous, free global delivery might be categorized under this descriptor.
The significance of recognizing these types of proposals lies in the efficient allocation of resources. By identifying and setting aside impractical schemes, individuals and organizations can focus their efforts on more viable and attainable goals. Historically, throughout both business and scientific endeavors, the ability to distinguish between imaginative aspiration and practical possibility has been a key determinant of success and innovation.