All the children had to wear a gas mask in case of a gas attack by the Germans. They tried to make the masks like Mickey Mouse faces so the children would like them. But I didn't. They had big ears on them.
And having suffered for part of the war when I was a child. I was too young to really understand what was going on but one of my favorite pieces of animation now is that Goodbye Blue Sky in The Wall because that deals directly with that period in time.
So war is an extremely sad business, because the majority of people don't want to be in it.
And when Roger talks about the frightened ones running away from the bombs, I immediately thought of my days when I was young and I had to wear these gas masks.
I think that an artist is a bit like a computer. He receives information from the world around him and from his past and from his own experiences. And it all goes into the brain.