Polysemy is logically motivated:
concrete to abstractMetonymy is using a word to denote something nearby:
Ex: sharp knife-> sharp mind
mundane to technical
Ex: chip of wood-> computer chip
Ex: White House = president
A typical examples of metonymy would be 'bottle' in I drank the whole bottle, where the container (BOTTLE) stands for its contents (the liquid in the bottle) – a container and its contents being contiguous or closely associated.