I had, of course, heard of psychic residue—residual forces left behind at the scene of any event, be it major tragedy or any powerful emotional experience common to mankind—love, hate, fear—and it was possible that something of this sort had brought about my dream, as were it the atmosphere of the house itself invading and possessing me while I slept, which I did not regard as completely impossible, since certainly it was strange and the events which had taken place there were experiences of impressive power.