True, naomi - I keep an open mind to it as there may be energy forms out there that we have yet to discover - take electricity in the past and how folk must have seen that. Visible signs like lightning, St Elmo's fire or static shocks but they couldn't be explained...
Having said that, try explaining what electricity is to a 5 or 6 year old....
A weird one that can't be fully explained is the presence of old churches in a straight line, allowing for the curvature of the earth, from St Michael's Mount to Norwich Cathedral - right through Stonehenge - this included the church next to my mother's garden, north of Truro. It's postulated that it's a major lay-line and the early Christians would locate their churches on the intersection with transverse lines - and, often, these were old altar sites (for the Romans et al) who had picked up on this. Spirits can move up and down these energy lines and why some folk in a room or wherever can see a form and others don't depends on their angle to the line....