As the plants in the wall grow and mature, the understory becomes denser. In daylight (this picture was taken in the dark using just the flash for illumination) there are small sections of the felt visible at the very top and bottom of the wall. In the body of the wall you have to dig in behind the protruding leaves to see any of the structural felt.
In the center of the picture is a dieffenbachia leaf that has grown in size to be much larger than anything the parent plant produced.
I love the colors and textures in the wall.