What are the kids doing with the spray paint and paper bags Crossing the wire?

In "Crossing the Wire," the kids use spray paint and paper bags to create makeshift signs and symbols that reflect their hopes and struggles. The spray paint allows them to express their identity and convey messages about their desires for a better life. This act serves as a form of rebellion and a way to communicate their experiences as they navigate the challenges of migration and survival. The paper bags symbolize their transient existence and the fragility of their dreams.