No more will my green sea go turn a deeper blue
The bereavement is causing the persona so much grief that he wants black, the colour of death, mourning, funerals, to replace all the other colours, especially warm, lively red. But the sea is different. Its colour depends on the colour of the sky: a green sea is what you see under a cloudy sky, and therefore on a cold day, so bathing is unpleasant. When the clouds go away and the sky is blue, the sea turns a deep shade of blue and also warmer, and becomes perfect for happy holiday activities - swimming, surfing, sailing, but he can't enjoy that or anything, so as far as he is concerned, the sea is an unhappy, cold green for ever.
No more will my green sea go turn a deeper blue The bereavement is causing the persona so much grief that he wants black, the colour of death, mourning, funerals, to replace all the other colours, especially warm, lively red. But the sea is different. Its colour depends on the colour of the sky: a green sea is what you see under a cloudy sky, and therefore on a cold day, so bathing is unpleasant. When the clouds go away and the sky is blue, the sea turns a deep shade of blue and also warmer, and becomes perfect for happy holiday activities - swimming, surfing, sailing, but he can't enjoy that or anything, so as far as he is concerned, the sea is an unhappy, cold green for ever.