Most often, if an image is everywhere and we know it, we are not inclined ever to pause and look at it carefully. When that occasion arises we are more inclined to make the effort to see. Artists have figured out a number of strategies that, intentionally or not, have kept their art from being successfully reproduced, so each work remains pretty much unique. If a painting were exactly two dimensional, that is lying perfectly in a flat plane, then it could be reproduced pretty well by purely photographic means. No coincidence then that many painters in this century pile up their paint thickly.
Uniqueness is preserved.
S omething similar holds for sculptors. Modern sculptors often evade that fate by the complicated ways they treat their surfaces, providing a high polish, letting them rust, sand blasting them with noticeable scratch marks, or even painting them. Mass production is again not possible. Many more techniques insure the same non-reproducibility. S ingular art can't be everywhere.