This is another one of those existential songs. I was thinking about how when man is gone, all our buildings and stuff'll sink into the earth. Even art will disappear. Everything'll disappear. Even stuff that most of us would consider to be immortal, like the Mona Lisa, for example, will disappear. It'll all disappear. And, on top of that, every one of us will be forgotten after our deaths. A few generations down the line, and nobody'll remember any of us. Nope.