I remember seeing a report on this house on 60 Minutes years ago. This article puts forth the premise that somehow she imagined being haunted by the spirits of those that died at the hands of the Winchester rifle.
As the author states: The windows have stained glass panels with lines from Shakespeare. One reads, “These same thoughts people this little world.” It’s from the prison soliloquy in Shakespeare’s Richard II. Deposed from power and alone in his cell, the king has an idea to create a world within his prison cell, populated only by his imaginings and ideas...she wove anguish into her creation, just as any artist pours unarticulated impulses into her work. Over repeated visits, I came to think that if a mind were a house, it would probably look like this."