 With this background, we can consider a way to visualize the mapping conception. We will consider how the account applies to an example similar to that of Oscar and Twin Oscar. To keep things simple, we will change the example slightly. Instead of regarding Earth and Twin Earth as two different planets both of which exist in the actual world, we will consider them as different ways things could have turned out to be on our actual planet. In the actual world, the watery stuff on Earth is H2O; in a possible counterfactual world, it is XYZ instead. We will envision Oscar looking at a beaker full of a colorless, odorless liquid and thinking a thought that he would express by saying “that beaker contains water.”