||The notion of .scale., in architecture, has a variety of meanings. In general, it refers to a graduate serie of symbolic elements that hold the place for real elements. It stands in close relationship with the notions of .model. and .representation.. A thorough discussion of the concept of scale should start with an analysis of the way in which we perceive natural objects, specially architectural objects. This perception appears as continuous but is not: there are some stages that can be identified as belonging to some .natural visual scale.. Traditional graphic scales do not relate clearly with this natural scale due to old technical problems. So the discussion proceeds towards the notion of multiresolution and how the concept of scale should be developped to cover properly the characteristics of virtual models, attempting to provide a conceptual framework for this discussion.