Simulated universe is impossible

[Ginsan]

It seems impossible because of this very simple argument. Even if you could compute with the smallest/most fundamental particle, you have to build a computer around them right? In order to simulate the movement of any given particle or combination of particles your computer would have to be bigger than that thing you are trying to simulate. Is there a way around this? EDIT: The title says that it is impossible but a few minutes later I realised that "seems" is the correct word to use here. It does make the title more interesting and dramating but that wasn't my intention and I'm sorry for that.