Is there a word to describe spatial/height imagery?
Solution 1:
I think the word that might be closest is "stature," but with a tiny bit of tweaking for usage.
The use of purposeful stature in this scene, illustrated through the protagonist 'kneeling and bending' while Alex is on his tiptoes, highlights the socioeconomic divide between Alex and the protagonist.
VS
The purposeful contrast in stature in this scene, illustrated through the protagonist 'kneeling and bending' while Alex is on his tiptoes, highlights the socioeconomic divide between Alex and the protagonist.