Now compare the lyrics of Pink Floyd's 1971 epic song "Echoes" to the death of the Soviet Union and the fall of the Berlin Wall in 1991 and 1989, respectively. "No one calls us to move on, and no one forces down our eyes, and no one speaks and no one tries, and no one flies around the sun." The flying around the sun part could be a metaphor for something like, nobody blocks our light anymore. And as for the fall of the Berlin Wall; "And so I throw the windows wide and call to you across the sky." The windows could symbolize the wall itself, and how it literally divided families for years. They were finally reunited.