Opacity makes sense if more solid is made to feel uncomfortable and therefore allow light in order to relax. Bit too much. There are open-plan space activities such as parties, etc.
The solid feel safe But if you make more solid feel uncomfortable. Therefore, allow light to enter. In order to be relaxed Not too uncomfortable Open up a space for activities such as star parties and so on.
The opacity to feel safe. But if the solid too much will make uncomfortable. Therefore, the open light. To feel relaxed and not too uncomfortable with space open up doing activities such as stars, party, etc.