Chap 3 explain the allegory that the director makes using water under pressure in a pipe.

The controller states that all human emotion or feeling can be seen in the same way as a pipe that carries water. Once the pipe has been lanced, water spurts out..... but if the pipe is pierced multiple times, each hole only leaks a small amount of water. Human emotion, like the water, can be stabilized to "small" leaks if there are multiple outlets or partners to consistently share it with.