Green dot pink dot Green dot pink dot …..

My uncle is the email-forward-expert in our famly. Some of the emails that he sends, though, are mind boggling. I would like to share the following optical illusion with you all.

Concentrate on the rotating dot, you will see the dots, pink in colour. Focus on the black ‘+’ sign in the middle, and you will see the pink dot change to green. In reality, there is no green colour in the picture. Wow.