Through the wall

This powerful graphic novel tells the story of a giant wall separating two civilizations: one of blue people and one of yellow. Each side is forbidden to speak to the other, crossing the wall, or even finding out what's on the opposite side, is treasonous. But one day, a boy peers through a hole in the wall . . . and finds himself staring at a girl from the other world. Together, they decide to break down the boundaries that divide their peoples forever.