City improvements, wonders, entertainers, and luxuries produce either 
content or happy faces in the city where they exist.
| These | Produce this |
|---|---|
| City improvements | content faces
|
| Wonders | content faces
|
| Military police | content faces
|
| Luxuries | happy faces
|
| Entertainers | happy faces
|
| Entertainment | happy faces
|
Each happy face affects the mood of one citizen.
- Each
content face makes one unhappy citizen content. - Each happy face makes one content citizen happy.
If there aren't enough people of the appropriate sort in a city, the effects of any extra faces are lost.