Whilst visiting Whitstable a few years back I picked up this reproduction booklet on Spectropia.
Spectropia works through the persistance of an image on the eye's retina after you've stopped looking at it. Mmmm let's perhaps add this to the reams of explanations to explain away those crazy people who claim to have caught a glimpse of a 'ghost' out of the corner of their eye... an event they they can neither replicate or offer any scientific explanation or proof for! As you can see I'm a sceptic!
Anyway, the idea is, in good light, you stare at a spot on the image for about 30 seconds or longer without blinking and then stare at a white wall or ceiling. Gradually the image you've been staring at in the book will appear in ghostly form on the wall or ceiling before fading away into nothingness.
I've scanned in the cover of the book if anyone wants to try to track it down and also one image which you can expand on your screen and have a go with. I would focus on the nose of the skeleton for best effect.
Saturday 10th November 2012
