If the audience is given access to the back stage, the actors have no chance to rest, and any descrepancies may be openly observed by the audience. This is why the actors tend to be very careful to keep the back stage well hidden or closed off. The actors must also be careful of what noise and sights can spill over the barriers constructed to separate the backstage from the front stage. Thin walls or transparent barriers can be just as revealing as if the audience were present in the back stage. It is also important to note that the region is defined as a back or front region by the performance.
Some regions can act as both a back and a front region depending on the situation.
Some regions, such as a church or classroom, appear always as a front region, even when no performance is in progress. The same is true for some back regions.