Hope that you have a happy day. To help celebrate, here is a little Christmas illusion. Just stare at the cross, count to 20, and then stare at a blank sheet of paper or wall…..
Have a great day!
Richard Wiseman
Quirky mind stuff
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usually this sort of illusions work for me but this didnt. anyways Merry Christmas!!!
Merry Christmas from Greece
That’s not an illusion. It’s a negative. Dur! #XmasFail
When I do it it produces an image of Richard Dawkins on a bad festive hair day – hope that is not a spoiler.
Nothing happened
Ah, if you look for long enough and then look at a white sheet of paper or wall, you should see an after-image of the picture, Sara. It was only vague for me, but I could see enough to make it out. Maybe you need the lighting to be just right. Merry Christmas anyway
Merry Christmas Richard and thanks for a delightful Christmas after-image illusion
Have a very happy Christmas and an excellent New Year 
What was meant to happen?
Amazing
———- Sent from my Nokia phone
Not working for me this time