Well I once heard a TV show producer say there was no new ideas, only rehashes of old ones.
The concept of reincarnation, time-travel, imprinting, does fascinate me. I got this story idea from visiting my aunt who lived in such an creepy old family house in Pittsburgh. She had photos and memorabilia going back decades. I looked at this stuff and thought about all the children who had grown up in that house, and all the things that had happened with-in it's walls, the happy times, the sad times. Somehow, they were all still there. Houses have memories you know- some you can see- like that scratch on the hall door where little Billy bump it with his tricycle that hot spring day in 1934- a minor event long past and long forgotten, but not by the house. Others you can't see- but they are still there!
Where do you think ghosts come from?