CLEAN : Germany: "Muted demonstration" outside trial on torture in Syria

The video discusses a project where clothes from activists are used to create human forms, symbolizing the muted voices of the Syrian people. The project aims to express their desire for dignity, freedom, and justice, emphasizing that justice is essential for the country's progress.

What symbolic action was taken with the heads in the artwork?

In what way does the speaker believe the country can move forward?