It most often appears in heavy rain. There is this really low res shadow that appears at the position on the screen where the original object was an instant ago. I say shadow because it is essentially a low res outline copy of that object that looks like a shadow. It is only visible in the sky and when there is heavy fog.
Also in a scene with volumetric fog, for example when V leaves his appartment and looks at that shining billboard on the other side. the lights start to move with the...

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