Optical Effects: Autostereograms or Magic Eye Puzzels.
If you stare in the centre of the image, let your eyes go blurry, dont blink and kind of relax them for around 2 minutes than a 3D image will pop out.
It really does work, took me a while but I saw it.
Click the arrow below to see the answer....
Love Love Love.
Its a heart beating right there for you.