Halliday & Matthiessen (1999: 585):
The grammar thus construes sensing as a bounded semantic domain within our total experience of change. This picture is further enriched through lexis, prominently through lexical metaphors. Metaphors relating to space, with the mind as a container (Reddy, 1979; cf, Lakoff & Kôvecses, 1987, on Anger), a finite space or a physical entity reinforce the grammar's construal of a bounded domain of sensing.