 Not all representations are of the same kind, not even if we restrict our attention to scientific representations (assuming they are found to be relevantly different to non-scientific epistemic representations). An X-ray photograph represents an ankle joint in a different way than a biomechanical model, a mercury thermometer represent the temperature of gas in a different way than statistical mechanics does, and chemical theory represents a C60 fullerene in different way that an electron-microscope image of the molecule. Even when restricting attention to the same kind of representation, there are important differences: Weizsäcker’s liquid drop model, for instance, represents the nucleus of an atom in a manner that seems to be different from the one of the shell model, and an electric circuit model represents the brain function in a different way than a neural network model. In brief, there seem to be different representational styles. This raises the question: what styles are there and how can they be  characterised?[3]  We call this the Problem of  Style.[4]  There is no expectation that a complete list of styles be provided in response. Indeed, it is unlikely that such a list can ever be drawn up, and new styles will be invented as science progresses. For this reason a response to the problem of style will always be open-ended, providing a taxonomy of what is currently available while leaving room for later additions.