A display system provides a display assembly having a display screen. A mounting bracket for the wall has a forward strip that extends laterally and is selectively friction fit into the groove, a back strip that extends laterally on the back face of the element, and a connecting web between the forward and back strip that is flush with the first edge when the forward strip is fully inserted in the groove. In a second method, iris pigmented epithelial cells of a bird or a mammal is isolated, and the iris pigmented epithelial- cells is subjected to adherent culturing. The first conductive material layer coats an inside surface of a cup-shaped opening formed in an insulating layer.