the moth as a piece of white, rigid satin cloth the speaker is playing on the point that people usually associate white with innocent. So our image is of the white innocent moth being like rigid satin. Now I'm no fashion expert, but it does seem like an oxymoron to have rigid satin, for satin is usually smooth. This oxymoron is probably there to show that the only way a moth could be hanging like a rigid piece of satin was if that moth was dead (for moth's wings could be seen as satin-esque and they would definitely be rigid were the moth already dead). So the dead moth is the innocent victim in this situation. Also moths are known to eat clothing like satin so that shows that even the innocent victim moth is a little bit evil. This example shows that the speaker wants the reader to kn
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