In recent decades, the idea in modal logic and metaphysics of possible worlds has become a widely used tool in philosophy. But are the hypotheticals discussed using possible worlds even, well, possible? To test this idea, I am going to try to construct an idea of possible worlds by way of mathematical models for making adjustments to the world as understood in both a metaphysically materialist/physicalist sense as well as what assumptions must be present for immaterialist/spiritualist claims to be true.