Halliday & Matthiessen (2014: 712-3, 719):
As illustrated by the example analysed in Figure 10-11, grammatical metaphor within the ideational metafunction involves a ‘re-mapping’ between sequences, figures and elements in the semantics and clause nexuses, clauses and groups in the grammar. In the congruent mode of realisation that we described in Chapters 5 and 7, a sequence is realised by a clause nexus and a figure is realised by a clause. In the metaphorical mode, the whole set of mappings seems to be shifted ‘downwards’: a sequence is realised by a clause, a figure is realised by a group, and an element is realised by a word. The two modes of realisation are contrasted diagrammatically in Figure 10-14 below.
