Are you sure you really see it disappear?

[FireCat]

If your eyes follow the movement of the rotating pink dot, the dots will remain only one colour - pink.

However if you stare at the black “ + ” in the center, the moving dot turns to green.

Now, concentrate on the black “ + ” in the center of the picture.

After a short period, all the pink dots will slowly disappear, and you will only see only a single green dot rotating

There is no green dot, and the pink dots don't disappear. How does this work?

 

[Accname]

A wizard did it.

 

[Varine]

A wizard did it.

Harry Potter, please stand up.

 

[Mahucharn]

*stands*

 

[tom_mai78101]

http://youtu.be/eJO5HU_7_1w?t=1m28s

 

[Varine]

*stands*

Make something levitate.

 

[Mahucharn]

WingardiumFREAKINGLEVITATEALREADY-osa.