How has Shmuel influenced Bruno’s perception of the world?

Despite being the exact same age as Bruno, Shmuel is much more worldly than the young German boy. For one thing, he's more intellectually curious than Bruno and much better educated. All Bruno really knows about the world is what's been drilled into him throughout his short life: that Germany is the best and that all other countries in the world are inferior. Bruno is surprised to learn from Shmuel that one of these countries, Poland, isn't actually in another one, Denmark.
Shmuel gives Bruno a broader perspective on the world outside the camp. But Bruno's still too immature to be able to appreciate just what he's being told. He never fully grasps the sheer scale of the atrocities in which his father plays such a leading role. Tragically, it's only when Bruno dons an inmate's uniform that he finally gets to see just what's on the other side of the fence. But by that time, it's too late. In that sense, one could say that Bruno only truly comes to share Shmuel's perspective on the world when the two boys are murdered together in the gas chambers.