How could we improve on our wind-up toy? Or, rather, what are some of its problems?
What happens when someone picks up the toy while it's going? What if you try to drop it somewhere you're not allowed to? Perhaps we should only allow someone to wind it up if they are holding it. What if someone winds it five thousand times? Perhaps we should allow programmers to make more complicated messages on their child objects.
We'll address each of these issues in chapter 2.
