The marching hammers first appear in the film as Pink's father marches off to war, leaving his son behind. They are also present when Pink is forced to attend a strict and oppressive boarding school, where he is subjected to harsh discipline and psychological manipulation. The hammers return later in the film when Pink becomes a successful rock star, but finds himself trapped in a cycle of excess and self-destruction.
The marching hammers are a powerful and disturbing symbol that represents the dehumanizing forces that can destroy a person's individuality and freedom. They are a warning about the dangers of conformity and the pursuit of material possessions, and they remind us that even the most powerful and successful people can be victims of these forces.