A third way is low + close, to build at a modest scale, three to five storeys, but compact enough to significantly increase the density, and hence proximity to services. This is the sweet spot between two extremes: the lowest carbon demand for the best quality of living. Over the next few weeks I want to explore some examples. This week: the UDIOBF, terraced houses that are upside-down, inside-out and back-to-front.