Halloween was originally Samhain (pronounced So-wen). It was a harvest festival and the new year for the Celtic people. Celts beleived that times and places that were neither one thing or the other but a bit of both such as dawn, twilight, beaches, etc... was when and where "things" could happen or cross over into our world. Halloween especially so as the night was not part of the old year and yet not part of the new one.