This is really interesting. They colorized a photo by overlaying some lines in a grid and ONLY adding color to the lines but oversaturating the color. The rest of the image is black and white.
The result is that at a distance or in the thumbnail it just looks like an ordinary color photo. It is only when you look up close you notice what is going on.
@Liberonscien
It's common in image compression to down-sample or dither color, as it doesn't affect our perception much. This seems like an exaggeration of that. The things our eyes would to to keep us sane are just insane.
@freemo