"I took this picture of my cat as he looked cute while sleeping. I noticed a small, black figure in the hallway next to the banister! There is a lot of activity on my property - it's over 100 years old. My cat doesn't seem to mind unlike most cats. He rarely hisses; sometimes he'll become restless and act weird. He'll often stare out at something, but then go about his business." - Zilla
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Close-up
Conclusion:
The human-like form in the background above the cat's paw looks like a little girl. Although it is an interesting story (and picture) about ghost activity in an old house, we believe the light on the figure makes it more of a solid person and not something vaporous. However, the grayed-out color is odd - even on the face.
Is it a ghost? You decide...