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?!