In addressing the association between mental functioning and external representation, Seeing Reason should, I believe, be commended for its success not only in progressing a theoretical synthesis relating to the topic of reasoning and representation, but in simultaneously tackling head-on various complex issues relating to the learning of reasoning skills. It is rare to find contemporary analyses of human reasoning that attempt to cover both sides of the theory-practice divide, let alone that endeavour to build a bridge between them . . . Seeing Reason is erudite (with an appropriate smattering of wit) and is a good example of some of the best published work in contemporary cognitive science. It is the kind of book that should serve to inspire new researchers embarking on the study of deductive reasoning.