"... Which made me think: we invest a lot in the learning opportunities afforded by conversation (it’s a core tenet of the dogme approach, after all). Yet conversations in classrooms are necessarily constrained, both by the relative immobility of the participants and by the lack of the kind of stimuli you get simply by taking a walk. ..."
In short, classroom talk (as Leo van Lier has frequently observed) is challenged in terms of contingency and affordances. By contingency, I mean a sense of connectedness – where everything that is said is connected both to what has already been said, and to the context in which it is said – taking context to mean everything from the ‘here-and-now’ to the ‘then-and-there’, i.e. the knowledge and experience that the speakers have in common.