What's the meaning of "pillars of salt and pillars of sand"? Is it a metaphor?
These lyrics are actually quite interesting. Based on context cues involving "castles," we can deduce that "pillars of salt and pillars of sand" here means that the singer's lofty castles, in the end, turned out to unstable and meaningless (as salt and sand are soft materials that cannot support much). Overall, he is lamenting that his hopes and dreams ended up being meaningless insubstantial in the end. It is not a commonly used expression, but a metaphorical expression that is used to convey the singer's feelings. Ex: The castle I built up in the sky ended up disintegrating amongst pillars of sand. Ex: I used pillars of sand to create a sand castle.
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