The Brain in a vat question assumes there is a difference between a simulated tree and a "real" tree. It's a classic case for what I was talking about because "real" assumes a non simulated world it then suggests there is a conflict about applying that word to a simulated tree. However a brain that grew up in a box means a simulated tree when he says the word "tree". So IMO the conflict is in the question/English and not in reality.

PS: Think about how people talk about the landscape in a video game.