This really freaked the shit out of me--the house nearly burned down. The morning sun, from about 8-10 am, caught the magnifying side of the accordion mirror just at the right
angle, and burned this big gash in the newly refinished wood. It is about 5" long. The room smells singed. This was really scary. Notice that the mirror is now neatly folded away in its position away from the window, until we buy a shade to hang in the window.