I saw a ghost once, or at least what I thought was a ghost. I was six years old or so, and we lived in a big Edwardian semi in Surrey. It was a winter evening and I was on the landing. I was alone, and I'd turned the lights out to get a better look at the flashing red lasery things on the front of my battery operated robot. Out of the corner of my eye, in the very periphary of my vision, I saw a flicker of light that I interpreted then as a woman in a crinoline drifting up the stairs and out of my view.
The sighting must have lasted just a second or two. If I shut my eyes, I can still see it now, both the image of the old fashioned lady passing across the landing, and the striated lights of a car passing by refracted through the windows and curtains, which is what I now think I actually saw.
More than the image, though, what lingers for me is the sensation – the liquid cold of apprehension, the prickle of hair raising on my arm and neck like the unexpected – uninvited, unwelcome - stroke of a cold hand. It was a moment of vertigo during which the material world seemed to shake and shudder away from me.
I think this sensation of transportation – as unpleasant as it can be – lies behind our obsession with ghosts and spirits. It's a somewhat mystical thing, and I have to say that I have found the experience of reading The Penguin Book of Ghosts a somewhat religious one.