What is an example of freedom in Among the Hidden?

In "Among the Hidden" by Margaret Peterson Haddix, an example of freedom is the character Luke's experience when he first meets Jen, another "shadow child." Jen represents a sense of liberation as she openly discusses her desire to fight against the oppressive government that restricts their existence. This encounter inspires Luke to consider the possibilities of defiance and the pursuit of a life beyond the confines of his hidden existence, highlighting the contrast between his life of secrecy and the freedom Jen seeks.