Position

The bubble should be put in a position that, first of all, people can see and read it. When the person closely interacts with the bubble, I also want it to be as if the bubble comes out of the person's head, so the bubble should not be rising too high. Slightly above an average person's height will be perfect. Besides with the people, the bubble also has a relationship with its corresponding object. For example, if the message is "lock the door", the corresponding object is the door. The height of the bubble is relatively fixed. The bubble should be just above or next to its corresponding object so that it is easy for the audience to make connection (association). There are places where the bubble should not be put to: 1. other objects will cut the sight of the bubble; 2. more than one nearby object can be corresponding to the message; movement of the object (like a window open and close) will interfere its position.