Halliday & Matthiessen (2014: 715):
Within the ideational metafunction, the general effect of this realignment in the semantic system is a shift from the logical to the experiential – an experientialisation of our construal of experience (see Halliday & Matthiessen, 1999: 264). Thus logical sequences of figures are reconstrued as experiential configurations of elements. But the significance of grammatical metaphor of the ideational kind extends beyond the ideational metafunction to both the textual and interpersonal ones. The textual and interpersonal effects of ideational metaphor are due to the fact the realignment of ideational patterns described above also means that there is a realignment of the textual and interpersonal environments in which ideational systems operate.