No! by David McPhail

No is the only word in this nearly wordless book. Said three times, it follows a young boy as he sets off in the city to mail a letter. Along the way he sees multiple acts of war: bombs, tanks, soldiers. He eventually meets a bully leaning on the mailbox and the young boy tells him, no and no! On the way home he sees acts of peace and people rebuilding together. It might be a book about war, it might be a book about bullies but I think it is really a book about children standing up for what they think is right and wrong in the world.