Halliday & Matthiessen (1999: 109, 110):
In (i) the 'content' of his thinking is the meaning. It remains internal to his consciousness and unrealised, i.e. unworded. In (ii) the 'content' of his saying is the wording. It has been externalised, realised as a wording. We will refer to these in the context of projection as (i) ideas and (ii) locutions. The contrast between these two statuses of projected figures is typically reflected in the shape of balloons in comic strip projections: see Figure 3-5.
