The preliminary assertion presents a metaphorical depiction of a previous state, contrasting with a probably totally different current situation. The phrase evokes a time when the atmospheric atmosphere, as perceived visually, lacked illumination and readability, resembling a heavy, obscuring overlaying. This might be interpreted actually, suggesting a interval of serious atmospheric opacity, or figuratively, representing a lack of know-how, understanding, or progress.
The importance of this preliminary situation lies in its stark distinction with the potential for subsequent modifications. Understanding the circumstances that led to this “darkish blanket” permits for investigation into the processes that will have altered it. This could illuminate the evolution of atmospheric circumstances, the development of data, or the progress achieved in overcoming limitations. The historic context, whether or not literal or figurative, gives a baseline in opposition to which to measure development and perceive the components contributing to any subsequent transformation.