For Example, the first picture could be of a piece of paper, the next is some scissors, then a rock, and then a hammer, then a big magnet, and so on. Or it could be a witch, then a house, then a house fire and so on.
It should be able to go on indefinitely, as long as people don't start going astronomical and keep it fairly simple. But there shouldn't be anything that ends it all as long as you are imaginative. good luck!
