Halliday & Matthiessen (1999: 595-6, 596n):
Since figures of sensing are reified as participants, they can themselves be construed in participant roles. Here another feature of the folk model is taken oven its spatial metaphor is retained and further elaborated. Thus the mind is construed as a space where the metaphorical participants of sensing are involved in processes of doing & happening and of being & having: thoughts, concepts, memories, images are stored, located, retrieved, activated and so on.⁵
⁵ The widespread lexical metaphor of memory as a kind of space predates cognitive psychology by many hundreds of years; see e.g. Yates, 1966, on medieval notions such as the "memory theatre" used as aids to remembering.