My vote for best "world under glass" goes to WOZ. They did a spectacular job with that. Only the versions with the monkey, of course.
BUT - I also think that in reality, and almost by definition, Dialed In is probably technically the correct answer. After all, the ENTIRE world of Dialed In exists under that glass, and nowhere else. Nothing is left out, or misrepresented, etc due to the fact that JJP created the world and the world is defined via the game.