Seville Optical Illusion

This photo was taken by Geoff Pettitt LRPS.

I was curious what LRPS stood for it seems he has been awarded a Licentiateship by The Royal Photographic Society. This is awarded either for competence in practical photography, or in recognition of the passing of an appropriate examination in photography by the Society.

You can view this photo and others of his at Brighton & Hove Camera Club.

This photo he titled Seville Optical Illusion.

You can see the graffiti on the wall in red, the initials AR.

But are those initials painted on the wall or flowing above the picture?

Has this graffiti been processed into this picture by some program like photoshop?

Looking at this photo it seems that the graffiti is not on the wall but on the surface of the photo itself. This effect is what makes this photo and graffiti an excellent illusion.

Again I request that if you run across illusions like this in your neck of the woods, send them to me.