See shapes and symbols.
Emphasises the importance of the thing, person or animal in that position; conflict, where the middle is between opposites; obstruction when something might be in the middle of the road, corridor, etc.; feelings of being involved, when in the middle of a crowd for instance. When something is in the middle of a circle or square can represent the self. Idioms: middle of the road; piggy in the middle, centre of attention.