Halliday & Matthiessen (1999: 590):
The spatial metaphor of the commonsense model is taken over by cognitive science. It serves as the sources of processes in their model of the mind — processes of storing, searching, retrieving etc within figures of doing & happening and processes of being located at/in within figures of being & having. That is, processes of sensing are reified, and processes of doing & happening and of being & having take their place. The spatial metaphor also opens up the way for modelling the mind along computational lines: human memory can be modelled on computer memory.