While this may not look like much to the naked eye, it is actually a long mirror attached to a wall in which an applied lead design is made to resemble a wrought iron gate. What you see in the mirror is a reflection of the garden IN FRONT of the mirror, not a gate, in which you are looking through to see the garden. I have always wanted to do this.
"An inexpensive way to brighten a dark corner is to hang a mirror that reflects light from sunnier parts of the garden. Here, not only does the looking glass remedy a black hole, but it also makes plants and flowers seem to stretch into an adjacent space."