Many familiar English phrases — "the back of my mind", "putting up a good front", etc., etc. — are metaphorical uses of space, based on the physical structure of our bodies in gravity. We all share four bodily, spatial contrasts: front/back, up/down, left/right (or center/side), and inside/outside.
These bodily contrasts are the spatial framework and the key vocabulary in MetaSelf's basic picture: two upright figures facing each other in a room, holding masks, offering gifts. This simple sketch helps us understand ourselves and embodies the principles of Conceptual Metaphor Theory. (For the theory in general, see a 67 min. video with George Lakoff. For some brilliant, specific work on the preverbal spatial foundations of our whole conceptual system, see Jean Mandler’s recent articles.)