While the concept of a wall is simple, its function or pattern is complex. A wall can block the way, prevent us from getting elsewhere.
A wall can also provide protection, like the cave wall here in Hocking Hills State Park.
Sometimes a wall provides support for hidden growth.
A wall can become a space for something else to exist.
A wall can even recede and disappear.
Our inner walls are like this, too.
The Inner Frame 