  On the flip side, the idea that the existence of a formal similarity between two material entities could mark anything interesting is conceptually confused. Given any two sufficiently complex entities, there are many ways in which they are formally identical, not to mention similar. There are also ways in which they are formally completely different. Now, we can speak loosely, and say that two things bear a formal similarity, but what we really mean is that our best formal representations of the two entities have formal similarities. In any case, there appear to be good grounds for rejecting both the Gilbert and Troitzsch and the Morgan and Guala grounds for distinguishing experiments and simulations. 