Does the term "learning journal" readily conjure up an image of something that is part of the normal mathematics classroom? Personally, do you ever use a journal of some form to help you organise your thoughts? Or, put quite simply--what is a learning journal? It might be that you are unfamiliar with the label, but journals are one type of strategy/device that can genuinely support learning in mathematics. The authors document, in detail, their classroom journey with learners and their "journals". The approach is rigorous, the reflection on outcomes is challenging, the benefits genuine so, the last question has to be "why not learning journals?" (Contains 3 images.)