This one is one of my favourite illusions. It is truely spooky and makes everyone gasp in amazement.
First you have to click on the image to see the animated Gif properly
. What you will see if a circle of pink dots which are disappearing.
The first spooky thing you will notice is that when one of the pink dots disappears it seems to leave a green ghost image behind. It gets better.
Stare at the centre of the image (the cross) for about 20 seconds. As you are staring you will see the pink dots disappear and are replaced by a single green blob moving around! Brilliant.Click on the image to enlarge it to FULL SIZE and animated