One dark night a few weeks back I was feeling my way across the lounge to the kitchen for the proverbial glass of water, when I just about leapt out of my skin. There, on the newly-painted white wall was a smear of slowly-moving ectoplasm.
No, nothing so exciting as an apparition from 'Ghost Busters' (why do I like that silly music so much?).
It took me a few heart-stopping seconds to work out what it was.
The glow from the street-lamp, now unimpeded by the palm that we recently removed, was shining through the warped old windows. But it was first being broken up by the gently moving leafy twigs of the oak tree way down at the letterboxes.
As you can see, the effect is quite spooky. You'll have to imagine the wraith-like movements. There was only a light breeze, so it was quite slow, like drifting smoke.