Because the dim light represents the past. The past is a mere shadow in the recesses of ones mind. Something will come along to send a spark over the memory for a brief period of time then it fades to become dim once more.
It has a childlike face, but an old persons long white hair. It has very muscular arms and hands, but very delicate pretty legs. In one hand it is holding a holly (a symbol of Christmas time) but its...
No, none of them, they all mean well. Besides, the Ghost of Christmas Past is the kindest of all, as she has several pleasant imaged to show Scrooge from a bygone era when even he was merry, happy...