Optical Illusion

I noticed this yesterday when I was zooming in to focus my padlock macro. This number 35 is recessed into the lock dial, but when zoomed in it looks like it is raised from the dial surface.

[Etienne]

That is interesting. It is very clear in the zoomed image, but less obvious in yesterday's picture when we have the full light/shadow context.

[Frogger]

@etienne I knew you would like it. It is interesting that in the thumbnail version, it looks recessed.

[bkb in the city]

Well done

[moni kozi]

Whoa!!! Even if I know it is recessed (as it is clear in the padlock image) I still can;t see it as such in this one. Here it is clearly raised! Mindblowing!