There is a structure to the associations found in people with synaesthesia: for instance, high pitch is small, bright, and high in space. The same correspondences exist in normal multi-sensory associations and manifest themselves implicitly as behavioural facilitation/interference on experimental tasks, and overtly when people are asked to 'freely' associate using imagery or metaphor. This has been termed weak synaesthesia; the implication being that it lies on a continuum with synaesthesia itself. In this presentation, I summarise evidence that compares multi-sensory associations from synaesthetes versus others. In addition to highlighting similarities, I also consider ways in which they differ. For instance, I propose that whilst the alignment of these associations is normally relative (e.g. 500Hz could be bright when compared against 200Hz but dark when compared against 1000Hz) it is absolute in synaesthesia itself (i.e. 500Hz has a non-relative level of brightness). Thus, there is similarity but not continuity between synaesthetes and others.