You have to be far away (20m away for the original) or squint a bit/cross your eyes and the big picture starts looking like the tiny portrait of Lincoln that yo

You have to be far away (20m away for the original) or squint a bit/cross your eyes and the big picture starts looking like the tiny portrait of Lincoln that you mention. You can also save that picture on your device and look at the generated thumbnail. Resizing it makes it a lot more obvious.