I liked this animation. The characters were so cute.
I think a small black one represents people and a big black one represents kind of crisis which people face. For example, it might be some disasters like earthquake or the big country which colonize the weak country. It means people are involved in such crisis, their house and all. In this animation, though a small one could escape from a big one, there were still soooo long line of the big ones. I think it represents that people continue to face any crises forever and try to recover again and again.
