The barbed wire symbolizes the cold barriers between the different nations in the world due to lack of comprehension. On this poster, the knots on the barbed wires are replaced by the acoustic wave patterns (The waves are the sounds of the word "Comprehension" in different languages). The audiences can use the mobile APP to scan the waves, then they will hear the word ‘’Comprehension" in different languages from the mobile. This poster engages the action from the audience, moving from "listening" to "thinking", and finally getting "comprehension". With comprehension, people are more likely to break through the barriers between different nations and religions, achieving the mutual understanding and reconciliation.