If a world can feel, it feels like a reality; if it can't, it’s just a mirror. A simulated self that actually has a sense of self would probably start to notice the seams, wondering whether the code is the hand that drew the picture or the paint itself. For someone inside, that world could be real enough to make them act as if it were new; to an outsider it remains a reflection of what the creator made. So the perfect copy can feel like its own reality, but only because the creator gave it that identity. In the end, what matters is the experience of the self, not the level of fidelity.