Call On Me (Ryan Riback Remix) Starley Download 'Call On Me (Ryan Riback Remix)' on iTunes
This is so clever we had to share it with you!
All you need to do is stare at the red dot on the picture below for 30 seconds.
OK now look at a white surface...a wall, piece of paper, your mate's incredibly pale and white back!
Blink your eyes repeatedly and a full colour pic of Beyonce should appear!