Hi all,

I've stumbled upon something that I find rather intriguing and can't figure out! Check out this picture I'm attaching. To see the invisible image in this picture, just tilt your screen back like it instructs in the picture.

What I am wondering is--how on earth did they do that? I've even zoomed in to the maximum on Photoshop to the lines of where the face seemingly appears, but I can't find a trace of any colors! What is going on here?!
invisible 526694_430457706971454_100000216865835_1914941_602763982_n.jpg

Thanks